Make buckets of fluid that do not consume the bucket return the bucket to the inventory instead of leaving it empty bucket in crafting table..

Are you referring to the crafting of speed upgrades with lubricant buckets? If so, see #139

Yes. And i saw that. But was thinking that just returning a bucket to an inventory would also be nice. And probably easier to do

Woops.. tried to scroll and hit close

I'm actually disinclined to add that change, for the simple reason that's it not consistent with any other mod I've tested with (e.g. Thermal Expansion enderium blend crafting).

If/when #139 is added, I think making speed upgrades would be a lot easier anyway.