k, if gear shift lever is in any position other then Park or Neutral (brake pedal pressure does not matter, but, for safety, I would apply brake), the ignition/transmission interlock system will not let you start car,...obv.....
sooooo, u said u can't get it into Park, did u try Neutral. U can start in N.
If you can't normally move lever to N or P, I would let dealership service sort out probable mechanical jam...Jeep 24 Hour Towing Assistance (page 90 of owners manual, 1-800-528-2069, or, got other roadside assistance????)..I'd write down any messages generated by your Electronic Vehicle Information Center, etc
This is a super long shot, but pp26 of your owners manual talks about "resetting" after failed attempt at using remote start. Might be in some wacky electron loop.
Couldn't find any reference to any manual "over-ride" to dis-engage jammed trans from Reverse or Drive positions after engine Off.
link for downloading SRT8 pdf manual in case urs not handy
http://www.jeep.com/owners/manuals.html#
"Reset" goes something like this:
1. insert valid key in ignition
2. turn key to Run
3. turn key to back to Lock
if u can then normally move gearshift lever to N or P, then try normal sequence of turning key to Start
Cheers & GL @ WSOP