Ideally I'd like both available to me when running the program, somehow, most of all within the editor.
I have no idea how and I say this without any real worry as I'll be happy when A10 is fully released and is standalone if necessary, just as I am about the potential of there being an update for BS with regards graphical features and other tweaks there might be and that being standalone aswell.
BIS did a good job with ARMA2 and OA. The Combined Operations feature of both being installed to the same target directory is a nice idea and one I'd have thought ED would try to implement. No idea how, obviously.
If anything I'd really like to be able to fly the shark within the A10 module's editor. I don't necessarily need there to be anything purely targeted towards what the BS module has within it, campaigns, missions and little images suggesting the BS is waiting there too, amidst all the shiny pictures of the Warthog, but it'd be nice to not have to quit the A10 module, go to options and choose the flight profile I want, so Black Shark along with the key configurations set up for the heli, and then go drop it in the editor and fly about for a bit. Or vice versa, not have to quit the BS module, if all I want to do is set the A10 up for a spin!! (literally! :)