hello,
in http://planetelderscrolls.gamespy.com/fms/Download.php?id=60323, once you reach a high rank in the imperial legion, you may send other members to arrest npcs (in imperial towns) and you may confiscate their goods. Guards may fail, and the target will lose disposition towards you.
You may also have an Imperial Guard as companion
In the Imperial Cult, once you reach the rank of Oracle, you may send other members to gather alms for the poors, or ingredients for helaling potions. You may also demand a shrine sergeant as companion (they use the scrolls of divine intervention to teleport away, if seriously wounded)
You may train these companions and other faction members, as well as promote them in the faction.
If there is a bounty on your head, you may ask the imperial magistrate to remove it (the imperial magistrate was useless previously)
In the Grand Council chambers, once you reach the top of a faction, you may reach an agreement with the representatives of other factions, to lower the prices in the imperial towns.