IPB 1.3.1 Import and themes

[Adan0s]

Heya,
i want to buy vB in the near future but there are still 2 questions left that i really need to get answered.

as i mentioned in the topic i need to import a IPB 1.3.1 database to vB (180.000 posts, 10.000 members, about 30 forums). is ImpEx able to really import the database 1:1 without modifications on the id's? for example there are some deleted topics/users etc so that for example the userid's 10-20 are empty and userxy has 9, userxz 21. if it tries to order those id's in a new scheme userxz would have the id 10 afterwards instead of 21. that's something i really don't want.
also our topics are listed on specific keywords on the top entrys of google and i don't want to loose or get changed id's so that before importing id 2100 is "bla" and after importing due to id modifications it's "blehrg".
profilesettings like avatar/signature/informations and of course the topics in the right forums are a must.

next question: is it possible to use a different messagebackground all 2 posts in a theme? (like it's shown here: http://doom3.planet-multiplayer.de/f...howtopic=12997 )

thanks in advance,
Sven