Give areas a travel scale field

When creating or editing areas put in a field where we can adjust travel scale. for example, let’s say i create an area called the eastern desert. I would like a field that lets me set how far the party can move in a single turn. right now i think it is set on a default of halfway between where you are and where you are going, but i would like to set that individually for each area so that i can generally enforce exploration within that area. in this manner it could be possible to create roads that will give faster travel times within that same area. the road being one area and the wilderness being a second area. the scale could be a slider that does 1:1, 1:2, 1:5 etc or it could be a box where you could set 1 turn is 1 day towards the destination or 1 turn is 4 hours.