'Mouse copy' is neat way of editing sexps, based on a design from Lisp Machines: https://www.mail-archive.com/gnu-emacs-sources@gnu.org/msg00393.html
This lets you copy the sexp under your mouse cursor and paste it at point. Saves a few precious keystrokes!
Full implementation here:
miniblog.
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My 3.5yo is learning to use a mouse, and it's super interesting.
He's mastered clicks and drags, but he hasn't yet figured out lifting up the mouse when run out of mouse pad. That's a tricky case where you deliberately break the relationship between mouse and cursor movement.
Trying to let my 3yo try as many different technology interfaces as possible.
Mouse: not too bad, especially after reducing sensitivity.
Keyboard: WASD is easy to lose track of in a sea of buttons.
Controller: requires both hands together, which is tricky. Arguably the left hand is more important too, hard for a right hander.
I'd heard the conventional wisdom that UX research states that mice are more efficient than keyboards, but turns out there's virtually no research on this!