Any fans of
MouseKeys here, the keyboard-based mouse emulation? Seemingly having quite a history in X and being a standard "accessibility feature" in Windows, it should be present on a wide range of systems.
It's not like I'd want to use it
exclusively, but it comes in handy is some situations.
Suppose you have a keyboard on your knees because there is no proper space for it on desk for some reason but the mouse still is up there, then MouseKeys will spare you from having to reach up. (That I guess also is why they sell compact boards with integrated pointing devices.)
I also feel that numpad 5 is more easily and precisely operated than e.g. the left mouse button, so sometimes I like to use this to click.
Finally, some practice with this might even make me grok the trackpoint... (If you're not used to these, you'll have a mighty hard time getting the mouse pointer where you want. I know I did.)