Tabbing in the forums rather than manually typing out spaces would cause less hassle for some people, and while it's not difficult to do 4 spaces to create a tab, the tab truly is simply easier for most.
I've already gone ahead and uploaded the necessary javascript file to implement this, all that needs to be updated is the 'textarea_id' in the doFocus function, and every textarea needs the following code:
<textarea wrap="off" onkeydown="return catchTab(this,event)" ></textarea>
No rush, just something I think would be nice to have.
http://files.byondhome.com/CauTi0N/2011-07/CauTi0N-0001/ tab_in_textarea.js