Heh, I know all about the explosive triggered mine trick. First couple times I played the game, I'd always try to use dynamite the first time I ran into captains and alchemists for the first time, when my own troops are severely undergeared, and I'd always learn about that trick the hard way as my own character took 400+ damage from an alchemist's grenade triggering my dynamite.
Only issue in my current game is that I don't have any explosives outside dynamite, so I can't do anything fancy like what you're suggesting. Fortunately, that's not a huge issue as I'm finally getting the second tier firearms out into the field, and those shotguns make a *huge* difference when it comes to quickly and effectively neutralizing mid-level threats.
Also, it's not so much that I'm following mission directives by choice, it's simply that there's no way I can conceivably kill off that many beastmen in a short amount of time with the gear I currently have. That'll change considerably once I get a couple soldiers with major sniper training along with scoped sniper rifles, but that's still at least eight days away.
I'd disagree on the capturing comment, though. I mean, I definitely do the same thing to some extent, but it's primarily when the environment hostility is too high for my current suits. But a low-hostility, mineless region that borders beastmen territory? That's a huge benefit, as I no longer have to worry about losing mines or potentially fighting off an invasion force in high-hostility territory.
My main complaint in my current game is that all the "Capture target unit" missions so far have been in regions with environmental hostility far too high for my current equipment. I can deal with that sort of thing when fighting off an invasion force or when blowing up a beastman portal, but I'd rather not feel pressed for time when trying to capture a unit.
Can you actually eat people in URW? I tried making meat from a random robber and the game said "NO!"
Cannibalism used to be a staple of the game, but it was relatively recently changed so that you could only eat human meat when starving (Or some similar state).