OK, I see I haven't explained myself properly :D
I know the feature you talk about. But I'm talking about (random)
single clicks being considered by the system as (undesidered) double
clicks ("random" because it doesn't happen all the time). By the way,
I forgot to mention that it happens with both left and right buttons.
In fact, it's a bug quite annoying:
http://lists.debian.org/cgi-bin/search?query=mouse+double+click&DEFAULTOP=and&author=&sort=relevance&HITSPERPAGE=10&language=en
Thanks anyway for your replies.
Cheers.