I should point out that the FAA and NTSB have made their position on this very clear in past enforcement actions. Regardless of whether or not there is other traffic in the pattern, turns in the pattern at nontowered airports other than in the published direction (i.e., only left unless otherwise stated, and only right if so stated) are illegal, and can cost you time on the ground. The only time you can bypass this is on a straight-in approach, and "
any turn into a straight-in approach must be made sufficiently far from the runway that it does not interfere with the normal traffic pattern." Based on the discussion in those cases, "sufficiently far from the runway " is a minimum of two miles out, and I'd say three to be safe.
For the legal details on turning the wrong way, see
Administrator v. Boardman and Administrator v. Dibble (5 NTSB 352 (1985) - not on the internet but quoted in Boardman).