You can't be serious about that. If you guys need a 5 mile no-fly zone then drop away from the airport and ride a van back. The jump plane might not be making money when people aren't jumping out of it but it's not my responsibility nor in my interest to alter my own activities to accommodate that. As I said in my first post we need to share the space, not hog it.
I didnt say it was a 5 mile no-fly zone, I said it was a 4-5-mile zone I try and avoid. If your origin and destination were exactly opposite of the airport, I would personally go through it in that situation however, even so to fly around vs through it's a difference of 15.7 miles vs 10 miles which even in a slow trainer adds only 3-4 minutes travel time (which is about the same amount of time you would lose in 2 standard rate 360's if you found yourself having to circle due to jump run already being in progress).
That being said, still assuming your origin and destination are on exact opposite sides of the airport, for each additional mile beyond the area your orgin/destinations are, your total distance to go around continually decreases such that eventually, you travel nearly the same distance to go around as to go through. If your origin and destination are both 10 miles from the DZ (20 miles between A and B ), your total distance to route around the DZ giving them 5 miles of space is 21 miles vs 20 miles to go through. Ill take the extra <30seconds it takes to go around in that situation vs potentially being held up due to jump run or finding my prop turned into a meat grinder.
I also use the 4-5 miles because it works well as both a radius and a diameter.
Think of it this way... There is an 4-5 mile outer ring (1 mile radius) and then a 2-2.5 mile inner ring (4-5 mile diameter).
If I have to go closer to the airport than the 4-5 mile radius ring then I know to be on the look out for the jump plane and be aware jumpers may be in the area. If I have to go closer still to the airport and go inside the 2-2.5 mile inner ring (4-5 mile diameter), I know I am within the DZ column and I better be really aware of where the jump plane is, what direction winds aloft and jump run is and make sure Im not flying up/down/through jump run.
I personally consider the 2-2.5 mile "inner" ring around the DZ a "no-fly" zone unless Im going into that airport. Inside that area you're definitely in the jump column. I dont know the last time I saw a jump run begin or end further than 2-2.5 miles though so flying just outside that is OK but you're going to hold up jump run since the jumpers and pilot aren't likely to risk jumping with you so close, so in the interest of sharing the sky, Im willing to add a minute or 2 to my travel time. If you give the DZ a 4-5 mile radius distance, you are definitely clear of the jump run and the DZ can feel free to drop whenever. As you said, its about sharing the air and since the jumpers dont know what you are doing or where you are going, if you start getting in closer than 4-5 miles and they spot you, they may hold our jump run until you've cleared the area for fear that you might turn and close that 2 mile distance between you and them after they've left the plane. The average freefall lasts about 60 seconds from 13,500 to 3,500 and a while a trainer would really have to be moving to get in close, 2 miles in many planes means you could find yourself in the jump column very quickly.
Its for that reason that I try give dropzones so much distance and when I cant, I treat dropzones like Class D (even though many lack a tower and are in fact Class E/G), a 4-5 miles (statute or nautical) radius covers the same amount of area as all but the largest of Class D's and I dont go buzzing through that area unless Im talking to someone.
I never took jumpers so not sure about that, but when I had a glider on, I would often get instructions from them. Might look funny from the outside looking for lift. Jumpers have their own protocol.
Jump planes and tow planes are different beasts. With a tow plane (whether a glider or banner) you're going to get more instruction on where to fly and how because they need to provide traffic avoidance/advisories for both you, your towed object and the cable connecting you. A jump plane is free to climb/travel more freely because they only need to provide advisories and avoidance during jump run. Even in an Otter with a really good jump pilot on a really cold/low density altitude type day it generally takes the plane 15-20 minutes to reach altitude and setup for jump run.
My distance of 4-5 miles is probably a bit excessive but I prefer giving the wide berth so the skydivers dont have to hold for me. It looks like the FAA considers a 1.5 NM radius around the airport sufficient based on the redesigned PHL airspace. When they redesigned it last year, they kept the airspace above Cross Keys (17N) out of the Bravo by making a little cut out for the airport Cross Keys (17N). The cutout provides 1.5 NM of space for the airport on North, West and South sides of the airport. I dont know if Cross Keys ever enters the bravo for jump run or to setup for jump run... They didnt used to but then prior to last year's redesign, the Bravo over PHL was not a full circle and it ended in NJ in a diagonal line that kept 17N, 19N, VAY, N14 and N73 from having Bravo airspace above them (an artifact of which can be seen in the boundary on the West side of 17N).
Of course the Bravo redesign made many other changes too, such as lowered altitudes, additional shelfs and rings and other really unpopular changes. Thankfully the final draft was quite different from the original proposal but there are still changes there that Im sure are less than popular.