ohaimark wrote: I actually use my space bar left handed almost exclusively too, though I just started trying the right bar. It's pretty weird.
I tried to use the right thumb for the spacebar just now: I wasn't able to keep it static on the spacebar like on the left thumb. I'm guessing due to how the hand movement occurs; my right hand does a lot more movement-- like to reach backspace and stuff, whereas my left hand can stay static more or less... which would be ideal for a key that gets pressed so frequently.
But keyboards favour the right thumb such as the M15-- with the modifier placed on the LEFT portion instead of the right... boo. There's no way I'm going to retrain years of muscle memory.