Thanks! I'll have to read up on OT. Our backend is totally hosted by Firebase, other than a simple Sinatra app that generates the unique IDs.

When you say synchronizing cursors, do you mean having multiple cursors (google docs style) or having a single cursor be in the same position for all clients? We are doing the latter, and I wasn't aware it was possible to do the former with ace but I would love to do it if I can