hand to hand spec:
the only reason people sometimes choose this spec is ground control skill to improve crush.
why?
-no dual wield attacks when you wield no weapons/shield
-crush is better than throw : crush ignores recovery, protective shield, doesnt need a free hand. Throw has better stunning, but if you wield a weapon and throw - you lose offhand attacks.
-considering first point, hand block is useless.
Fighters will take h2h spec if they would be able to, for example, throw with staff. Or in case crush will be 2/2. Now I don't see the reason to waste one spec for useless ground control (some more damage and nothing more).
weaponmastery manual:
and idea to improve it: ability to perfrom weapon skills like bleed/strip/backhand from offhand.
Weaponmastery manual can be read by all fighter classes. Did you offer us too see stripping assassin or backhanding thief? In another side fighters will be too powerful if they would take 3 specs and then find bleed in such manual.
weapon focus: why no focus in hand-to-hand combat, spear/staff, whip/flail?
Agree. And weapon focus from wielding spear/staff should give double damroll bonus (coz you can wear only one staff).
why bleed and cross slice cant be performed while mounted? what is the difference between those and pincer/undercut which go fine from mount?
Agree. Pincer can lag the opponent and can be performed while mounted when cross slice doesn't make any lag and can't be made on mount. By the way, lag from undercut should be a least 2 rounds.
Why lunge does piercing damage, not weapon damage?
The damage type of lunge should be the same with damtype of first weapon wielded. And also lag from lunge should be 1 round.