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As per this FAQ post, certain maneuvers use weapons and others don't. Disarm, Sunder and Trip are assumed to be weapon-based by default, and if your weapon has the "trip" weapon quality it can be used to deliver a drag or reposition maneuver (those would normally not be weapon-based). Any weapon-based maneuver can benefit from Weapon Finesse if your weapon is finessable.
Agile Maneuvers states plainly that you use your DEX bonus on all maneuvers.
As for the Bolas... It's not explicit in the rules whether being a ranged attack gives DEX to CMB. I think most people go with "yes". Check with your GM.