Yeah, a good signature campaign should definitely be in the pipeline
Regarding chats (aka trollboxes) specifically, they are a required feature as most people like sharing their wins with others and look for support when they lose. But please don't fetishize it, i.e. don't make a fetish of it (as some casinos as well as exchanges often do) as trollboxes can be annoying as fuck, especially if you can't switch them off for good (in the very least, hide them)
Exactly, I mean people online when they gamble with Bitcoin all share a common trait, (if they are public and use the same name, not like those mysterious whales I mean), they just like to share, discuss strategy or really just kill the time while playing. Personally I don't use chat very much at all at any of the dice sites I play at but I always keep an eye out for it. And the popular sites have chat, simple as that.
AND OF COURSE as you said, make it optional so it doesn't screw up the site look or speed.