My information is the following:
-Yes, if it is NOTt too close to the sholuder of the tire (I indirectly found this out... When I was getting new tires put on, they took one off and found a nail (it had not lost pressure yet. It was close to the shoulder and was RUBBING on the sidewall due to angle.. runflat or not that might not have been pretty)
-They cannot be patched twice (or they can, but its not safe)
-For every patch (in ANY tire) you take the speed rating DOWN one step (not that that is an issue on or 168 top speed limited car - unless you have a blower and a StealthV tune)
Reed