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Distance which can be broken down into different factors.
- Travel times: Pretty straightforward, travel times between regions could possibly be universally reduced, say by 20% or any other number. This would mostly help reduce the impact of the continent's major geographic barriers (deserts and mountains), as one still can't move more than 1 region per turn, no matter how small the travel time.
- Troop morale & wear: Distance from realm can incur serious morale loss, stacked on top of high equipment wear. Reducing wear from travel and morale penalties can help realms be effective afar.
- Sea zones: the travel system is unintuitive. The sea zone limits are as well. Aside from the tweaks proposed of allowing one to turn back and the like, one could make it so that all sea zones take exactly 1 turn to travel, and the borders could be re-drawn to minimize zigzag paths the current ones favor. I had already proposed better sea zone limits some time back, I could dig these back up.
- Seasons: the travel penalties could be revisited. I don't think BM really has a Scandinavian climate, so the travel modifies don't need to act as if the troops must cross through two meters of snow.
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Re-drawing the sea zones is probably too time consuming to happen, but if the travel options were fleshed out and the speed increased maybe 10% it would help.
I completely agree on winter needing to be revamped. The travel times get ridiculous, especially in regions with bad roads. I would prefer to have the winter travel times make all regions act as if the roads were bad instead of stacking on top of road condition penalties.