I've been a member here for 14 years, I've owned three Roadsters, NEVER heard of a key "sticking" in the start position.

Generally, a bad crank sensor will work fine with a cold engine, but not when engine is hot - so I'm doubting the CPS is the issue.
I'd verify that fuse 11 is ok (fuses the plugs/coils) and then I'd measure fuel pressure at the rail and if you have 58psi +/- 3, I'd check to see if the plugs are really firing and go from there.