Suggestion: Hand Pump (like a bucket with 8 times capacity)

Probably part of the BuildCraft submodule?

Instead of working as a big bucket, why not just make it empty water cells/lava cells, and use the M key to switch between lava and water?

Carry multiple units of liquids is an intresting idea!
But i prefer that it can load/unload cells instead that have an internal storage...
This way we can transport lava and water in BIG quantities easy, as lava and water cells are stackable.
If u can switch between modes, and have an internal storage wont the water and lava be stored in the same container? in that case we'll have obsidian into the pump

Quote from Keymaster89

Carry multiple units of liquids is an intresting idea!
But i prefer that it can load/unload cells instead that have an internal storage...
This way we can transport lava and water in BIG quantities easy, as lava and water cells are stackable.
If u can switch between modes, and have an internal storage wont the water and lava be stored in the same container? in that case we'll have obsidian into the pump

It's already done, except you won't put your lava/water sources where you want, but just in the crafting grid/machine.
And it won't be change, because it's the aim of the lava/water cells. Store a lot of sources but just in order to be used to craft Obsidian/Feed Gen/Make coolant.