Peregan's skill lets all archers in his army fire first, but i agree you should get the option to use skills and choose targets when they do.
Trailblazer lets you cast 'Place Road' on any terrain. Without it you can't cast place road on some of the Sorcerer Lord's and wraiths' terrain types.
I think with Geomancy its similar - normally 'Restore land' can only be cast on desert or barren terrain - with Geomancy you can cast it on any terrain type (e.g swamp, frozen, frozen forest, shadowland terrain etc)
Also archers, snipers, trog archers etc all have far too low initiative. Knights, riders etc seem to get to act twice or three times sometimes before archers can fire.
And there also seems to be something weird with initiative - melee units almost always seem to get to act first even if e.g a ranger or mage hero with items and lots of scrolls of destiny used on them has 20 or 30 higher initiative than them