Unfortunately that has been put on hold indefinitely. We are a very small company trying to do a lot of big things. Without going into too many details we started down that road but about half way through other things sidelined it. We have a few pressing things at the moment but we are looking into seeing what we can salvage from what was done and hopefully put some of that to use.
Is it a matter of API programming or are there issues related to Roll20 specifically?
Actually, I'm not sure. One of my tasks in the near future is to look into this. I wasn't part of the original development of this asset so it's all new to me. I'll dig into it as soon as I finish up a few other things and see what the status is and if I can salvage the work already done.