With the new FTB server some things have been left a bit vague to me.
1) Very -few- features have been disabled to preserve performance (3 features, that is it!) however, everything else is intact!
Which features have been disabled and for what reason?
2) Are there special rules that apply to FTB?
3) If there is going to be spawn can you specify a plane of x,z coords that we should avoid building on?

Any information is highly appreciated and thank you in advance.

I only know that Computer Craft(sadly) and Portal Guns are disabled.

then my question is now, why are portal guns banned?
i think it is possible to disable moon portals so...
and if its the block moving feature then graviguns need to go too
as for computer craft... never got a definitive answer about that...
i think broonie said that computer craft put the server at risk but i still dont know why.

The portalguns make allot of lagg, and are extremely unstable. Seen them crash servers, while the gravitygun only lifts one block.
When it comes to the computer craft i think the chance for overflow and abbuse is abit to big, not shure if logg-block works on them aither.

I belive that the computercraft is because it can cause security problems!

From the news page:
FTB Ultimate now online

Posted by BRooNiE in Server

FTB Ultimate is now online at Crazy-Fools.co.uk, as included with the web server move.

You can play at : minecraft.crazy-fools.co.uk:25665

Please be aware, this is a limited release and is fully open to bugs/problems/whatever arises.

Enjoy!

Initially, 2 mods have been disabled due to performance and security issues, Computercraft, and portalgun. We'll try leave everything else as is!

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As stated above, portal guns can easily cause servers to crash (using 4 portals will crash you're single player game easily). Computer craft is same as on tekkit as its a little too powerful and is a security risk.

Rules will be the same as tekkit.

And the spawn by the sounds of it in other posts is that it will be where spawn is right now.

Only unnamed rule I can think of is the one I talked to Broonie (brownie, lol love iPhone spellcheck) about. Basically, remember to tread carefully with mystcraft and avoid trapping people in other dimensions. Apparently no one likes to have to die to get home. I would like to have a spawn though. The hole we call spawn now is kind of lackluster xD

And yeah, a lot of portals can take down a server easily. So can computer craft it would seem.

FWIW there may be an issue with ANY form of warp/teleport combined with gregtech. Gregtech seems to have a problem with chunk loading, if you walk into and out of range its usually sorted out by the time you reach the chunk but if you "port" to the chunk you can catch it incompletely loaded. Signs of this are machines looking like advanced machine blocks.