cough**what typos**cough
there are a lot of settings we in IT can do to how and when you can edit your posts, well, a couple settings and a lot of options for those two things. I will look into extending it a bit. I believe I set those months ago based on one of my pet peeves. That would be people posting, everyone commenting and quoting and discussing, then the thread starter OP person coming in and deleting or completely changing his post.
In addition, Firefox spell checks posts for you as you make them, it is my best friend and works wonders. I am a horrid typer, speller, and pretty bad with grammar unless I am really focusing and thinking it out, which is pretty rare. I also make a lot of the same simple reverse letters when the one finger is faster then the other finger type mistakes and Firefox really saves me a lot of embarrassment, not all of it, but a lot. Not sure how IE handles the issue at all.