[grincho]

I can't solve all your problems, but here are a few I can do off the top of my head. I hope they help somebody.

Hold keys and click to move a window: https://mmazzarolo.com/blog/2022-04-16-drag-window-by-clicki.... I love it. Bind it to a mouse button with USB Overdrive for extra convenience.

In the terminal, use emacs-style bindings like ctrl-A and ctrl-E to move to the beginning and end of lines. On the Mac, Home and End are for beginning and ends of documents.

Use USB Overdrive or Steermouse to bind mouse buttons to whatever you want, including Paste. Select-to-copy might be impossible, though you could certainly do select-and-click-to-copy.

Cheers!