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Sensible Rebels (updated for T&T)

This mod prevents most rebel armies from spawning with units that are too rare, elite or loyal to be found in the hands of filthy traitors. Skaven & Greenskins rebels can still spawn with some higher-tier units due to them being relatively low-tech and their factions being noteworthy for infighting.

I'd expect a rebel uprising to start with core soldiers and basic equipment, not 6 helblaster batteries and more demi-gryphs than the whole royal menagerie...

New Model Empire - A major military reform act from Karl Franz
Reiksguard Foot - elite Empire units
Armoured Empire - Empire state troops with extra armor
The Lost and the Damned - cultists for chaos and mortals for vampire counts
The Lost and the Damned 2: Full Mortal Jacket - an expanded mortal army for the vampire counts
Sartosa Free Company - mortal pirates for Sartosa
Mercenaries - a modding resource for those looking to add mercenaries to any faction
Aaahh!!! RARE Monsters - reduced unit size for ghosts
Huntsmarshal Tweaks - reduced hostility & modified Imperial Supply units

Also:
Selian's Blackguard Variants - Blackguards by Selian, updated