I can't find any rules that explicitly state at what range you can perform some combat maneuvers.
Most combat maneuvers are clear: Overrun is about moving through an opponent's square(s); Steal uses your natural reach (or a whip's reach); Disarm, Sunder and Trip are performed in place of a melee attack, so I assume they have that attack's range.
Reposition is a bit fuzzy, in that it mentions your reach, though it doesn't clarify if you count your weapon's reach.
But Bull Rush, Dirty Trick, Drag and Grapple don't mention anything about range. Can I Bull Rush someone from 30' away? What about 10' with a reach weapon? Grapple says you move your opponent adjacent to you, so can happen beyond 5', but under what circumstances? Drag talks about moving back 5' and having your opponent move into your square – so can I not use the hook on my pole arm to drag someone?
This question came about from my considering a Foehammer archetype build using a Dwarven Longhammer.
- Can I Bull Rush adjacent enemies back 5' so they are threatened by my hammer? Can I do this while unarmed at that range?
- Can I Bull Rush from 10' away? You'd think a pole arm should be able to fend someone off, so maybe…
While I'd like specific answers to these questions, it'd be nice to have the basis for them clarified, too.