[lug] gimp selection dimensions

[D. Stimits]

I have some large images I want to break down into multiple smaller 
images, each of which would print on normal 8.5" x 11" paper, and then 
they'd be reassembled onto a backboard as a single larger image. I know 
I've seen some web-style gimp scripts in the past which can automate 
this by cleanly cutting a large image into something like 4 equal size 
proportional images, but either I can't find it, or the things I've 
found just don't work (possibly related to updating gimp breaking 
scripting tools). So, unless I can find a way to automatically cut this 
image into 4 parts, I need to do this manually.

In the case of doing this manually, where the image is about 6000x4800, 
I can't do a pixel exact selection, the monitor and mouse resolution is 
just too low...zooming is not an option because then I can't select 
large enough areas. So what I'm wondering is if I can't find a way to 
automate this cutting into equal-sized pieces, is there a command line 
or other tool that will allow me to select rectangular regions from the 
keyboard? I.E., I want to type in the rectangular selection dimensions 
via the keyboard naming the exact location of the selection via 
keyboard. Any hints?

D. Stimits, stimits AT comcast DOT net