It seems like you guys liked the changes from the last update based on the poll so I've just made some misc improvements to the last GUI version since then. Also the Server Editor has been implemented. Config & Lang file updates!

SubEditor:
SubEditor is a Server editor that allows you to change the subserver values via the GUI. It can also optionally edit the files corresponding to whatever changes you make (such as changing the port/directory)

You can suggest some things SubEditor should be capable of at the discussion page.