http://bugs.winehq.org/show_bug.cgi?id=6504
--- Comment #8 from Alex Haan armeagle@hetnet.nl 2007-10-17 06:51:24 --- Ah, indeed. The weird output was caused by running imwheel (to get firefox go back/forward in history). I disabled that so that I get nice output in xev on the extra buttons (buttons 8 and 9). But LOTRO still doesn't recognize them.
I've been trying to find a plain windows executable that simple logs all mouse events (a xev variant), but had now luck.