Well part of that all ready exists. If you set the arena up as you want it for that event you can then use the CM tools to create and save the arena tables. That would at least allow you save your field and plane setup, however it does not save everything like CV locations, and there's no way to have it load, or reset automatically.
I have created such a table for the current FSO setup. I can load the terrain, then load my saved table, change ownership of one strat zone, and finally move the CV's where the Admin CM want's them, and then the arena would be ready to go all in about 5 minutes with just a couple of clicks. (I'd spend a good 30 minutes double checking everything after that!

)
However, there's not a way to cause all that to happen automatically, and like I said, there are limits to what can be saved for example, the strat zone ownership has to be changed very time I load the map and table.
BTW I agree about the dump to desktop on a map reset, but between new tools and new planes or fixing the dump to desktop, I'll take the tools and planes!