To make tactical combat more tactical I'd like to see some special tiles like
1) "special height" that gives advantage to defence and archery
2) "open field" that give advantage to cavalry attack
3) "rough terrain" that gives advantage to the defender
4) "swamp" that slows down movement etc..
There could be 0-3 special tiles on a tactical map. So one has to decide which he like to claim and so on.