It should be able to handle 2-key functions, so this is strange. Make sure you don't have "stickykeys"; ie another key or function is silently and continuously inputting while you try programming the SST. One way to check, if you have Win 7 is the On-screen Keyboard.
Sound like you have the TIR centre key set to match the snap look left down. This needs to be programmed by the user, so the best way to make sure you beat it is to erase all references to views ingame and build it up from there. Time consuming, but I fear necessary.
Haha! Welcome to the club, mate! I have been flying the Ka-50 for near 3 years now, and I still suck using unguided rockets. It's all about a fine control touch and trimming your ship to set up the run a couple of km before strike. Also, make sure you loose the rockets at maximum permissible range, so that you can break off the attack with out having to overfly the target.
Bloody hard if you are target fixated! :pilotfly: