Well, interesting thread; I'm no pro but I'd like to chip in with my experiences.
Imo surprise ending is useless against defensive wars although immense fun to see it trigger against other specialities. Knockout may prove effective against defensive non-Urk non-IronJaw wars. Feint may prove useful with slow, high-damage weapons. Game mechanics may change if balancing is required; I'm sure Nate keeps doing his statistical analysis. In the past the Theatrics could easily bleed out a war; also they had a Second Wind skill which refilled stamina. Today it may be difficult for them to face a defensive war but that's the fun.
I wish sotc was here to share his experiences too.