1) No I don't think so... you can always try...
2) Yes, when editing in your browser, 20 is a space, so when you type, make two spaces, and you'll see 2020 in the browser, change the latter to the number of the color you want and whatever comes after will be in color.
3) A lot are grey on combat ops, works better on LS and i think DM?
Try the numbers between 11 and 18, those are the ones that work...
4) Try not to double post =]