I don't particularly want to customise. I would like wide comments (e.g. containing <pre> text) to not force the whole page to be that wide. I would like to b

I don't particularly want to customise. I would like wide comments (e.g. containing <pre> text) to not force the whole page to be that wide. I would like to be able to hide sub-threads if I do not find them interesting. (Whether this should be considered as voting down each individual comment I don't know.) Actually, I wouldn't mind being able to choose between writing comments in markdown/textile/etc.