It would be nice if there were an easy way to integrate with your mod via other mods with a basic, documented command or process.

I manage another mod that has several surface types that increase movement speed for the Engineer.
It would be nice if I could flag one or more of these as higher/lower tier roads options for the trucks to drive on and incur the set speed bonus of those surfaces!

This is already supported I think, to register custom tiles as drone roads, set is_road_tile = true on your item prototype - the mod's data-final-fixes.lua will add the correct collision layer automatically

Regarding speed bonuses: drones have affected_by_tiles = true, so Factorio natively applies each tile's walking_speed_modifier to their movement in theory, your tiles with higher modifiers should make drones faster automatically

Oh!
I will look in to that, thanks!

I was also planining to write about this ... case.

I have marked Asphalt roads as road tiles, and the drones will use this tiles on their deliveries. However this will work ( for some reason ) only if the suply - request depots are actualy connected with Transport Drones Road tile. So placing Asphalt in front depots will block deliveries. In a brief moment i think it actualy worked, but after some updates and Road networks resets, it no longer works. So if you could look into this.

I was also planining to write about this ... case.

I have marked Asphalt roads as road tiles, and the drones will use this tiles on their deliveries. However this will work ( for some reason ) only if the suply - request depots are actualy connected with Transport Drones Road tile. So placing Asphalt in front depots will block deliveries. In a brief moment i think it actualy worked, but after some updates and Road networks resets, it no longer works. So if you could look into this.

might be better with 2.0.24 (also let's handle asphalt road as actual roads by default anyway, toggle in settings)

It seems to work. Drones will deliver their cargo via Asphalt roads. But there are still issues and one bug swithing between versions of Transport Drones from Meglinge and yours, so i need remove all my road network and redraw it a new.

Thanks for quick fix support. Now shall I try Dectorio Gravel roads ?

I will write about that bug in another thread.

Hmm ... cant place Stone brick on the ground.

As mentioned above i have removed all the "old" road network and wanted to from scratch build new road network under this mod version 2.0.28. When i wanted place stone brick it was shown in red, As if illegal placement. Road tiles was green. I think when you updated to Dectorio compatibility you must hit something that prevent placement of stone bricks.

Reverted back to version 2.0.24 and i couild place stone bricks.

Hmm ... cant place Stone brick on the ground.

As mentioned above i have removed all the "old" road network and wanted to from scratch build new road network under this mod version 2.0.28. When i wanted place stone brick it was shown in red, As if illegal placement. Road tiles was green. I think when you updated to Dectorio compatibility you must hit something that prevent placement of stone bricks.

Reverted back to version 2.0.24 and i couild place stone bricks.

Thanks for the report, hopefully fixed in 2.0.30