Due to the way the Vaccinator was changed in the 2015 update, the Über Duration upgrade in MVM does nothing to the actual duration of the Über.
This is now fixed using a server side mod. Each upgrade now adds an additional 0.5 seconds per level, applied to each individual Über charge for total up to 6 additional seconds per full Über meter. And up to 4.5 seconds to each individual resistance given, from the original 3 seconds.
Big thanks to Shylo for pointing this out to me, as I had absolutely no idea!
Going to a new map on FLF during an active game will now tell the discord about the map they'll be playing
Updated the Paper Spigot backend to the latest build, improving performance and fixing assorted potential bugs
A suggestion from YK, demomen can now use their crit canteens in MVM setup to set traps. They will not be killed to avoid spending their canteens.