We do have rules:
http://www.tomshardware.com/forum/id-2083458/read-forum-rules-styling-posts.html
Generally, they boil down to "don't attack other posters" (and we have a fairly broad definition of 'attack'), "don't swear", and "don't post spam".
Beyond there, you're probably not going to get into much trouble.
Bumping threads and intentionally using poor english are annoying, but probably won't get you a ban. We know some people can't speak english well, but people who just post in txt speak are a pain.