Contrary to Wims post, I think you're looking for nick modes (ie: +i is invisible), rather than channel modes (ie: +i is invite)
If so, you might be able to get these from a /whois on the nick. I use RAW 379 in my Whois/Whowas dialog, but have found that it's not supported on all networks. You might try using a debug window, then whoising someone (other than yourself), and see what, if any, raw mode returns the information you're looking for.
