I suggest such settings:
fractal gen obviously
temperature - 0,
wetness - 100
also 1x1enabled, and separate poles disabled
What this gives is map full of "boreal forrests" and mountain ranges, that unexpectedly look like mountain ranges!, all of this is very wide polar zones. There is some grasslands hillls, plains near equator and for balance it should be ensured that ether noone starts there or everyone starts there, this might need human intervention.
Why I like it: tons of forrests, like in real history, you will need to clear them to make land more hospitable. Mountain range limiting movement in serious ways providing for interesting tactical and strategic possibilities. Though I would change mountain def bonus to practicly 0, to disencourage slowly and securely creeping in them, making mountains serious path blockers. There is big advantage for such maps with hex topology; squares create those mountain ranges but often they are passable using diagonals, no such issues with hexes, making those range very appealing looking.
I'd also suggest low resources/specials 50 at most, 25, or even 10.
Please someone write some thoughs;) I'm planing opening polls for boreal and special settings separetly in few days.