I already know, I only need to do it. But it's not as easy as you
think...

it's a really good idea! why don't you ask steet to makee it possible?

Actually, it's a good thing. DeviantART does that, but something
happened recently that was very annoying for many people: A (now
deleted) user on DA sold traced pictures from popular artist and every
comment or reply she got to tell her to "stop" or "it's not right to
do this! You should give the origonal artist credit", she would delete
it, making it so that everyone couldn't see them. Some good reasons
for this would be to delete spammers and stuff, but then again, no one
should be spamming anyway.

Yeah, cause other places such as, youtube, DA, has those options. Why
not here?

Exactly what Native Dreams said.

I don't know why. Why don't you suggest this on the forums? That would
be really cool if artists could control the comments in their gallery.