Heh, I actually removed the ability for Trolls to mountainwalk in my local version. I didn't change them in this module because, as I remember, they were the key recon unit for the Jotnar.
Units that can mountainwalk:
* Any unit with the Dwarven, Giantkin or Trollkin promotion
* Any unit led by a Giantkin or Trollkin commanders
* Any flying unit
* Greater Rutila Scorpions
* Haunts
* Meskwaki
* Yvain
* Mother
* The Mithril Golem
* Heralds
* All Druids, as far as I know.
This is way too many. Flyers can move into peaks, of course. But apart from Heralds (who really should be flying, considering they are in a chariot led by pegasus), Giantkin and minions on the same tile (Giants are the only ones I can really see stepping over mountains), and maybe the Mithril Golem (because anything a Giant can do you can be damn sure this thing can do too), none of these units should be mountainwalking.
Except maybe Meshwaki. Because what the heck is a Meshwaki? Why do I not know that?
I don't think it's quite that simple. There are good reasons for all of those units to be mountainwalking:
* Any flying unit => Well, they're flying
* Heralds => Same as above
* Greater Rutila Scorpions => Unless I fail to use the pedia reader that's the only effect this promotion has + it's a pretty high level promotion so it's not like you're going to see that many of them
* Meskwaki, Yvain, Mother, The Mithril Golem => These are all World Units, they are meant to be powerful and they can only exist once so they can hardly be made responsible for there being to many mountaineering units.
* Haunts => Perhaps they don't need to be mountaineering, but like the World Units they are UU available to only a single civ and they can't even be build, making them unable to move through peaks would hardly solve your problem
* Any unit with the Giantkin or Trollkin promotion => The vast majority of mountaineering units since many of them are common barbarian units, perhaps you could remove it from Trollkin, though I always understood them to be so well adapted at living in the wilds that they can climb mountains which are impassible for human armies. And giants really shouldn't be bother by mountains any more than humans are bothered by hills.
* All Druids => Same as Trollkin, except that Druids are late game national units who would have very little effect on the overall number of mountaineering units in the game.
* Any unit with the Dwarven promotion => I guess you could remove mountaineering from dwarves, there is no reason why they should have to be any better at climbing mountains than humans. That being said, you could easily come up with a reason (e.g.: They are the children of Kilmorph and thus are better at moving in uneven terrain, similar to how the elven are better at moving in forests) and mountaineering is important for their gameplay, we want dwarven players to settle in hills near mountain ridges, that's why they get production from peaks after all. Yet without mountaineering, settling near mountains would make them almost defenceless against mountaineering barbarians and they would have trouble hooking up resources on the other side of a mountain ridge.
* Any unit led by a Giantkin or Trollkin commanders => Didn't even know that, guess you could remove it, though that wouldn't have much effect except against human Jotnar players.
PS: Pedia Reader FTW.
AI not getting decimated by animals and barbs would be very welcome ^^
anyway.
