Thanks for the ideas.
The Mamlukes won't attack Jerusalem with all those lords in there, there are easier targets for them.
I could try becoming a lord - I do want my own faction and clearly the easiest way would be to join the Crusaders and then rebel. I might try that but it wasn't my game plan :/ I was planning on nobbing off on my own at some point and trying to set up an island duchy or somesuch.
I've tried suggesting courses of action to the marshall (the king is pretty useless). The marshall is a bit of a **** and, while he will follow me when he's not busy, is generally disinterested in my advice. If he's leading a campaign he tells me where to stick it and he won't even let me suggest somewhere to attack
Staying in one place for a long time is not an option - the Crusader States are at 1/2 strength until this issue is resolved, and the Mamlukes will take full advantage if I sit back.
My options seem to be
1. Become a lord (might not work and would mean changing my game plan).
2. Find out how to do these save modifications (again might not work if the only thing I can do is change location - the lords in question might just march straight back to Jerusalem and carry on being pussies).
3. Leave them to it and strike out on my own (very risky as I was planning on waiting until a suitable location was surrounded by settlements owned by my good friends, the Crusaders).
Bummer. Sorry to be so negative haha.