Right now, an assistive technology using gnome-mag needs to listen for mouse movement events and then tell gnome-mag the region of interest for a zoomer. This seems very inefficient to me, and I think it may be what is causing some refresh rate issues when the user is using the mouse to navigate the screen.

If gnome-mag were able to support four mouse tracking modes for a zoomer, we could eliminate the need for an assistive technology to track the mouse for these purposes, which would probably vastly improve the refresh rate.  These four modes are:

1) None - the mouse isn't tracked.
2) Center - the mouse is positioned in the center of the zoomer when possible.
3) Push - the zoomer's region of interest is updated when the mouse hits an edge of the screen
4) Proportional - the mouse's position in the zoomer reflects the zoomer's position for the overall logical display