Slide Release...
JOHNSON... I have several CZs (w/ decocker) and like you, a Sig P229R... You CAN release the 'slide release' on the P229 very easily with the SAME HAND (ie. right thump while still holding the gun)... You really CAN'T do this 'comfortably' with a CZ (SP-01, 75B) its a L-O-N-G stretch... So for me, while holding the gun (w/ right hand) I release the slide-release with the LEFT THUMB... Different, but for me, absolutely NO PROBLEM!... If this is what you're referring to.