Alright, so before we go further - I started writing of an explenation of the means that I would see for abusing some of the tactics that have been suggested. Halfway through, I realised that this could come out sounding quite rude (i.e., "ur stoopid, ur idea is broken and dumb").
Just to make this clear, I'm not trying to say that anyone or their ideas are stupid. I'm just playing the devil's advocate, in an attempt to design an abuse-proof system (or at least abuse-resistant, since proofing is nigh-impossible in EVE) by using my viewpoint as an FW participant to explain how I think things might be used abused - hopefully we can then get around these issues.
Nonetheless, if any of you guys feel like I'm being rude/insulting/trollish, just say, mmmk?
It'll be fine Esna, the idea here is to come up with good game mechanics, not for me to stroke my ego, if you have a solution you think of as better, point it out.
If constellation occupancy resulted in some further benefits this might change.
Here's a thought. What if you used the Incursion mechanic in a non random way to spawn core empire invasion forces in the border faction warfare constellations? The associated militias would naturally come in to support their side. If the invasion is repulsed within a set timespan the system stays with the defenders. If not occupancy changes.
This would also have the benefit of controlling where the major fighting would take place. As a result server resources could be concentrated on the frontline systems.
I don't think that would work quite that well on its own, because I feel like the faction defending would farm the sites instead of quickly defeating them, which is the problem with Sansha incursions right now, and those don't matter in the scheme of things.
Okay, this is gonna sound like a really crazyish idea, but hear me out. Well, here's the non-crazy part first, since that might actually be a good thing to have ingame. Taking each constellation causes a defensive bonus and maybe gives the defenders some trickle passive income. If they're active in the warzone, and killing enemy ships, and taking sites and things, they earn LP based on the number of constellations their faction controls. This provides clear, obvious reasons for people to go out and actually help out, and to try and fight the war. You toss in some objective based plexing as well, like the plexing version of sansha incursions, and Couple this with the mission changes I talked about in the OP, and you have some decent mechanics.
On to the ridiculous. You have enemy forces invade the border highsec and lowsec constellations of their opponent faction. When this happens, Militia forces can enter the highsec without getting killed and the systems drop into a combat state. The two sides battle it out and run plexes and combat sites and try to do as much damage or to mitigate as much damage as possible. When all is said and done, if the defenders win, that system is uninvadable for the next month, if the attackers win, the sec status of the systems in the constellation drops by .1, and when all the systems in that constellation have dropped into lowsec, the system becomes a normal facwar constellation, and when that happens a constellation on the other side gets 'targeted for increased defenses' at which point the sec of that constellation starts trickling up, continuing at a set rate until the entire constellation is highsec or the enemy militia manages to take one of those systems in that constellation. As sec status goes up, it becomes exponentially more difficult to take a system, meaning that taking a .9 might require a 1500 man fleet and several weeks of concerted effort, and taking a 1.0 in theory possible, but requiring more people in system then are online at one time in eve right now.
Now that idea is very rough, and very needing to be polished, and I know it would never be accepted because it destroys the precious status quo that CCP is holding onto for fear of carebear retribution.