I have been a full time model01 user for a long time, and though I have settled in with the main layout (and my switch to colemak), I still have regular trouble reaching and remembering various keyboard shortcut variations.
I have been having this problem for a long time, but I never really thought deeply about it.
But now I just realized what causes it!
On MacOS the applications I use, use all combinations of shift, ctrl, alt and cmd for shortcuts.
But since the model01 only has four thumb keys and I use one for space/backspace, that leaves only three.
So to make up for that I have shift and cmd on both, but only alt on the left and ctrl on the right.
To make things even worse I also need AltGr for typing international letters, so actually I need both left and right alt. I tried to solve that by making the butterfly key into left alt. But it doesn’t really work that well.
So I can see that my layout is not really optimal as it is, as I am constantly having problems, but I don’t know how to solve it.
Suggestions are welcome.
I think my feedback to @jesse is that I wish the Model100 has five thumb keys. Maybe the the two thumb keys, nearer the center of the keyboard could be three slightly smaller keys?