I'd really like to see the "sector controller" idea, as currently used in the Battle of Britain scenario; become a standard feature of events where appropriate.
It definately adds genuine depth and immersion to the event; and I can think of many historical applications for it.
I can see that there may be technical difficulties in having both sides with controllers due to the three country set up in AH; and I appreciate that controllers themselves may be hard to find; but I do believe the effort to be worthwhile.
But for now; just for starters; the Mosquito raids on Scandanavian Gestapo HQ's and guiding night fighters to contact are just two examples where the sector controller idea could really bloom. I'm sure there's many more.