If you want to! But since your script is a bash script and this us a Perl script, you may have trouble keeping it in one file.

Personally, I think the 'dw' script is best kept for the really common operations such as updating, syncing, making patches, etc. But of course, it's your script, so feel free to do with it what you will!

And yes, Dre has a tools repo! Or more accurately, Dre and Afuna do. There's info on how to use it here: http://wiki.dwscoalition.org/notes/Dev_Tools