Even if you don't make some kind of hardware integration, then that could be another way to perhaps make more than the never ending $1 sales?
I know it's hard sometimes and not cost effective to revisit old projects, but if you really think about it, it might be a little work, but fairly easy for them to do to make more than a buck? Please keep the original modules and add new ones.
~Pretty Please
Edit: Better yet make it modular( hey it already is), then still only charge us a buck for any add-ons like Loom, Vacuum Pro, or Hybrid. lol /js