[organsnyder]

The mouse layer maps keys to mouse movements, buttons and scrolling: hold down the mouse key (or lock it on if you have that mapped) and you can use the arrow keys (JIKL by default) for mouse movements, and other keys for buttons. From a USB HID perspective it behaves identically to a regular mouse.

I haven't used the trackpoint module, but they've put a ton of thought into every other module, so I expect it would be quite good.

I'm a bit of a pointing device hoarder (I have at least four different trackballs and a couple of ergonomic mice), so I always have a few close at hand. I find myself using a regular trackball/mouse (alternating between my favorites to reduce RSI) for my primary pointing device, but the mouse layer is very handy for when I just need to move the mouse a bit and don't want to move my hands from the keyboard.