I can sorta see issues with creators being unable to change their topics at will (so as to prevent stuff like "blah blah blah topic" being turned to "EVERYONE IN THIS TOPIC IS GAY LOL" if the person goes off the deep end), but it wouldn't be too bad provided we all don't abuse it.
As for being unable to close topics...that's strange, and I have no idea why that wouldn't be in place here already. I mean, even inferior message board reference deleted has that, though you have to have no posters for a set amount of time. But, all you have to do is ask the admins to close your topic here, and I'm sure if you explain, they'll take care of it for you, so...