Is there any way to make battles more strategically decisive?

[oudysseos]

I have reached a point in my Antigonid Campaign that I'm sure we're all familiar with: stack after stack (in this case Roman) of low-grade units attacking in waves. In reference to the Happy Cannae Day thread (there's a theme song in there somewhere), I have fought and won 3 or 4 Cannaes and Carrhaes combined, with a Pharsalus and a Marathon thrown in for good measure. My last battle I fought with one small (17 unit) stack of elites against three full roman stacks, almost all leves. I lost 152 kia versus more than 5000 roman dead.

When will these guys give up? Is there a way through traits or scripts to make major victories decisive and final? I try diplomacy after every major victory but no: "some of you still live".

I realize that this is not a fault of EB but of the RTW engine, but there's gotta be some way to make military results have political impacts. Any thoughts?