Empty coolant cell idea
Now when coolant has its buildcraft liquid form, it can be used for engines and stored in tanks. But You lose resources when you store them in tanks because cell just disappears. So my idea is to a empty version of coolant cells . They would be stackable and they would be returned to you when you pour coolant to tank cart, tank etc. and they would become coolant cells when you empty tank with them and maybe they would rarely appear in reactor when coolant cells evaporate so they would be able to fill them with proper amount of water to gain new coolant cell.
Fuel integration idea
So buildcraft has fuel, IC has fuel, why you shouldn't able to store fuel in tanks and when you need to refuel jet-pack you just go to it with fuel can and gather it?
So my idea is to use fuel cans as a bigger bucket for fuel and bio-fuel cell/can get its own fluid form or just contain less of fuel.
If anything is unclear i'm sorry but that may be because English is not my native language I am from Poland.
Please rate this thread.
(this is my first suggestion so if there is some kind of way to post suggestions please correct me (don't be to mad at me if ideas are bad))