Now that I've actually had a little time to actually sit down and look at code, I've been back at work on the web UI. I've now got text pasting working, though it seems to still be a bit quirky.
It works, but I still need to do a little looking into how capitalization is handled for pasting in MESS. Also, I'm not entirely happy with putting it in a side panel so I'll probably look into adjusting that before I submit the new code.
After I've got the pastebox stabilized to my liking, I'll look into text uploads. There are a LOT of security implications involved in that, so I'm going to have to be very careful.
Expect the basic text panel submission within the next day or two.