Did anyone get a solution to disable the Home key?

I'm running a study using the 770 and I have to disable the Home key so that people don't exit the experiment.

I used:

xmodmap -e "keycode 71 = F6" (which is the maximize key)

After this, xev says that the home key sends 'F6' just fine, but the behaviour is as follows:

Let's say I'm in xterm:
- Fullscreens xterm (the desired effect)
- Minimizes xterm and returns to home (the thing that I want to stop)

If I press it again:
- Returns to xterm
- Un-Fullscreens xterm

It seems like the behaviour of the home key is hard-wired somewhere. Anyone know how to change this?

Thanks.