Just had a bit of finger problem, and instead of hitting 3 to request deviations for turbulance, hit 4 by mistake and cancelled IFR, thus shutting down RC. Would it be possible for v5 to include a confirmation that I do indeed wish to cancel, or put the cancel option on a separate screen, to avoid this problem?

I agree. I too have butterfingers, and on a long flight it can be cumbersome.

in v5 you will switch from ifr to vfr, vfr to ifr. i don't think this will be a problem in v5.jd

Goodo!