i like the idea of a TT expander. it could conceivably work on the same ii port as the ww/mp/es.
but in reality, the amount of time and money invested into such a project would mean it'd have to be a personal hobby project at a loss-- given most of the projects monome does are on the threshold of profitability and that there are very few teletypes in use (considering the size of the modular market).
this said, the firmware is open source. i know some people may be sick of hearing some of us constantly re-announce this, but a DIY 8-digital-output expander would be as simple as hooking up an arduino with quite possibly less than a dozen lines of code. and then some very simple modifications to the teletype repo. these are the sorts of projects that i can throw in pointers if someone takes them on (given they have at least some experience with arduino etc).
the modular community seems like a great place where people commonly do small batch mods. we're one of the few companies that are trying to encourage this activity by providing source. DIY is the solution when there's a small demand for a very particular functionality. i'm looking to empower these endeavors.
now-- if TT ever merits a version 2, i'll certainly consider a new feature set. the best way you all can help further development of TT is to evangelize its awesomeness, which i know many of you do and i thank you!