Why can I not cut or copy when typing in the text box?

What I mean is when I am typing a message in to the text box (or whatever you want to call it, I am typing in it right now) I cannot cutor copy text. I use cut/paste and copy/paste a lot for editing posts and not being able to do this really cramps my style and is just odd. I usually right click and select "cut" or "copy" but I do not have these options and it is only on this site. I have even tried the little scissors button at the top of the box and that doesn't work.

I don't get it. I can paste from other sites. Just wondering as I have tried a few times now and it is kind of annoying to have to re-type everything rather than cut and paste to edit posts.


/end rant