Yeah the type rating thing could make it complicated.
Yeh.. It seems that logging time really depends on what you intend to do with it.
The "hobby types" seem much more willing to log PIC in whatever they manipulate the controls in, because they can.
For the professional type it seems to boil down more to a "should I?" Not can I. While it would be rare, and you'd have to have "one of those guys" giving you the interview, logging PIC for 1.3 in an aircraft you are not really "PIC" familiar with could potentially set them up for failure in a future interview, should someone peruse their log books..
Kinda like this:
Interviewer - "Ah, you've got 1.3 in an Mu-2 huh?"
Applicant - "Yep!!"
Interviewer - "Fun to fly?"
Applicant - "Yes sir, it was a blast."
Interviewer - "I see you logged PIC in it."
Applicant - "Yes sir!"
Interviewer - "Shorty or the Marquis?"
Applicant - "Huh?"
Interviewer - "Does the Mu-2 have a tiller for steering?"
Applicant - "Umm.. uhh.. huh?"
Interviewer - "What sort of hydraulic system does the Mu-2 have?"
Applicant - "Umm..."
Interviewer - "Why do you always pull the prop through several revolutions after flying your Mu-2, Mr. PIC?"
Applicant - "Uhh.. Umm.. Welll.."
Interviewer - "Did you make sure to visually confirm proper direction of the AILERONS before flight?"
Applicant - "Always!"
Interviewer - "Really? You checked the ailerons, eh?"
Applicant - "Of course.."
Interviewer - "-10's or -8's on that Mu-2 Mr. PIC?"
Applicant - "I was just manipulating the controls, I guess I wasn't really the PIC."
Interviewer - "Why'd you log it?"
That's what concerns me more than just logging it. I'd hate to get cornered simply because I wanted to log 1.3 hours in a Moo-2.
Of course the same could be said of almost any aircraft and then again, I've got a handful of hours in various aircraft I was undoubtedly the PIC as twern't no one else in the bird and I have no doubt Johnny On The Spot could quiz me until I missed something. Some of the birds it was a "Please take this airplane to Las Vegas from Decatur, we'll pay you!" and I had no info other than what you could surmise during a walk around.
All that said, I've found if you generally have a good answer to a tough question, you'll be just fine.
They'd rather hear you say "I don't know" than BS your way through it.