I know I'm hard at work on the patch! =)
Problem with "pathfinding" is that it could mean anything. For instance, it might be units clipping, unit ai, the actual path-planning a unit does, mele combat, you tell it to go here and it gets lost, collisions/pushing other units, etc.
Here's an example, lets say you tell a unit to kill a building.. he starts walking towards it.. the building dies, the unit stops moving.
While most would say "pathfinding", this example would fall under unit AI since it was a decision made by the unit to stop walking along its current path because the building died.
What this means is, its nightmarishly hard to get real details on what the problems are. Our pathfinding engine 99.999% of the time finds a route to its destination if one can be found. So when someone says "pathfinding problem", I have no idea what problem they are refering too So when you want pathfinding improvments, please be specific to "units can't make it to destination", or "stop fighting", or "push each around", etc... that kind of info helps us a ton!!!