I really like the Alt+LMB drag feature to move windows by clicking them anywhere, but what about making it work for keys other than Alt? Like as a hotkey for an action?
A hotkey wouldn't work because it basically disables that key when pressed. So if Alt was done as a hotkey instead, then you wouldn't be able to press Alt to show the menu bar on a window (because the hotkey code "swallows" the keypress). At the moment it's done as a keyboard hook, which is why it lets you drag the window and also press it to see the menu bar. To support custom keys, I'd need to code it for every key on the keyboard, which I'm not going to do. Sorry!
Understood. The reason I asked, though, is that holding down Alt and dragging the mouse on a web page is good way to select text that can't normally be copied, so I was hoping I could use a different key to Alt.