Nexus Clash

Allow tiles to be of more than a single type, such as the Quickway Bridge, which would be Quickway + Bridge.

As you will find later on in the map, Quickway is defined not by a specific tile type but by a neighborhood
There are non-Quickway Bridges in Cordillera, and as you will find, there are non-Bridge Quickway elements
-- Kandarin, 1, 2

This could allow for interesting combinations, where the search table of a tile may be determined by its building type when inside, and its other type when outside.

It's pretty easy to make a new tile using another tile as a base, so functionally we can do the same thing by grabbing the bridge tile, giving it an interior, and building an interior search table. That said, I assume that admins could manually do what you're saying. Current mapmaking tools don't automate that process.

Tiles that are dynamic and changeable by player input are A Goal, but it likely won't look like this - the idea is more counter to the way tiles are built than you think.