my multiplayer warp solution: WORD INSERT HERE!!
instead of the warp deny zone thingy, everyone has a month, plays that month, sims that month, does whatever they want to in that month, and then they stop at the end of the month, simple! you can have as many warps as possible and it pretty much solves the warp problem in multiplayer!
and here's the other good part of it: it means unlike Stellaris and other games like this, you can play for about an hour, and then stop, then play again tomorrow, you don't have to set out an entire day for nothing but the multiplayer game, then get disconnected for about an hour and lose everything, you can keep the data in one save file and you can keep coming back to it day after day, week after week, month after month? whatever you want, you can just do it for all of eternity! because you don't have to be completely dedicated! and another thing that might work is that you can have more then one game available, and you don't have to play on one game at the same time.
the problemsolving part: so you have a station in orbit of Kerbin (nice job!) and someone is coming to resupply it, but you already have the docking port they need taken, so what do they do? you give permission to separate people to be able to control ships around the station! it allows the people you want in your station in and the people you don't out!
IT WORKS!