You must have severely deformed thumbs if pushing a button on your wheel is that hard to do for you. Don't blame me for poorly assigned buttons, I told you and everyone else who cares to read my posts how I would do it if I didn't have the G25 but a Momo instead. Most wheels have buttons on the wheel within reach of your thumbs, if yours does not, you should consider getting a new one like the Momo, which is dirt cheap.
Like I said, at least it's manually operated, which makes it more realistic than having LFS do the clutch work for you in a manual car. The auto clutch is not part of the simulation, it's a player input modification of sorts. Your car in LFS does not have an automatic clutch if the option is enabled, LFS just operates it for you.
Not in LFS, where it's either a proper manual or a proper sequential, no computer controlled thing that's something inbetween. I'm not saying they are bad, I'm just saying there is no such thing in LFS.