i like the idea of a decent sized trackball for my left thumb, i space with my right, probably the reverse would suit a lefty, or maybe i have that backwards because i am right handed but swing left, runs in my father's family, via his indonesian mother

i'm pretty sure i could use a sufficiently large, smooth, and free-spinning trackball as good as a mouse

but again, i'm mostly doing fine with the flat ortholinear keyboard and a stadard mouse

most people barely use these devices, in actuality, most use laptops and mobile phone touch screens now, they suck but they don't impede the speed at which these people can type anyway, it's only weirdos like me who can actually type over 80wpm and play somewhere near the top-middle 25% of FPS gamers