Well I just uploaded my first update to my world in a couple of months, and as I used my new functionality I was reminded how cool Byond is.
My guide building functionality simultaneously makes use of the browser, the panels, input windows, and the ability to change the attributes of turfs on the fly.
Without much work, I've been able to put together an amazingly useful interface (haven't even had to stoop to forms).
I will be stretching savefile sizes...I've currently elected to save all my images in one savefile, and it's already a quarter of a meg...
You mentioned savefiles ... did you ever resolve that problem you were having earlier? We're finally attempting a ceasefire on new features so as to maintain stability, so I want to make sure that the especially error-prone methods (like savefiles) are working okay.