Can you give us the option to remove deepsea oil with landfill?

This already appears to be the case in a plain install. Placing tiles, including landfill, generally deletes entities that collide with it. Can you describe the situations where it doesn't work?

Could be using SE or some other mod that turns on https://wiki.factorio.com/Prototype/Tile#check_collision_with_entities for all tiles perhaps? If that is the case, then setting https://wiki.factorio.com/Prototype/Entity#protected_from_tile_building to false on the deep sea oil would allow them to be placed over.

Ah, Xorimuth thanks for reminding me, that probably explains it. And for the other reports. I'll get them bundled for released next week.

No rush on my part - I fixed them myself in X-Logistics yesterday :)