From my DBPro adventures, I found the best plugins (coincidentally, they're free too!) are;
Advanced2D
Matrix1 Utilites
D3D Function
There's also an Xbox360 DLL which will assist with Xbox wireless controller, it's awesome!
Further to this, I found I became most productive with DBPro when I started using the Indigo Editor, created by Balid. Give it a shot, hopefully you'll love it.
Oh, one last tip is searching. I created a search bookmark which speeds things up when I'm trying to track some information down;
https://www.google.com.au/search?hl=en-GB&q=site:forum.thegamecreators.com+dbpro