I love it to bits

I hate text boxes. You know these boxes you get on Gmail, twiki, etc .. where you are supposed to write your text. Then they only have limited editor functions. No delete line, No goto beginning, but this has an end now with
https://addons.mozilla.org/en-US/firefox/addon/4125
you can edit these boxes with the editor of your choice. And it is amazing. Just click the little edit button and your defined editor fires up and you can start editing in real time.

If you are stuck with twiki you should have a look at http://www.neilvandyke.org/erin-twiki-emacs/
this combination makes wiki pages actually usable