I figured out an awesome trick in twin peaks, this will allow you to defend the flag as long as you want to (play 1:0 in rbgs and defend the remaining time to the win).
there are two ways,
the first way will require a warlock:
1. use demonic circle on your graveyard
2. grab the enemy flag
3. use your demonic circle port
the other way will require a priest:
1. grab the flag
2. run to the graveyard
3. your priest (standing @spawnpoint) uses leap of faith and grips you up to the graveyard
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it works on every graveyard in the bg and some of them also got some good points to LoS spells as well.
note: deathgrip WON't work while you're on the graveyard, you'll be immune to it.
here are two screenshots for one of the alliance graveyards
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use it while you can