Maybe I'm missing something, but this didn't work for me. I downloaded xmodmap from the Lancode.de repository, then followed the instructions in this thread, and while it changed something, it definitely didn't enable right-click. Some widgets wouldn't respond (which they would to a normal left-click), but widgets that had, say, a context menu, behaved like I'd just left-clicked them normally, rather than displaying the menu. (e.g. links in Tear)
Is there something I'm missing? I exported DISPLAY properly, and ran it as root.

Also, is this supposed to disable F6's fullscreen functionality? I didn't see anything explicit in the source to do that, but I've never played around with this sort of stuff. If not, is there a way to do that?