Really fix the talking crash this time, I'm pretty sure
Fix light masks for dark towns
Fix walkway and wall trims; not sure why shore frills don't also work
Don't bother to run through keystroke handling when the key pressed is a modifier
Get road connections working, and convert grass/hill road crossings from old scenarios

In classic BoE, to make a road cross the boundary of grass and hills, you would place a "road on hill" terrain where the boundary should be, and the game would automatically convert it to the correct type of boundary before drawing the road on top. Now, the game expects you to place the proper boundary there instead, meaning there is some more complicated logic to determine when it needs to draw a road across a boundary, or, in some cases, two consecutive boundaries. It works for the surface world of Valley of the Dying Things; there may still be some edge cases that need fixing.
Fix the issue where tons of special points appear outdoors