I think it would be cool to have a pipe where you can specify how to craft a Fluid opposed to an Item with several of the mechanics that craft fluid, Tinkers Construct, Thermal Expansion, Forestry, Buildcraft ect.

I was going to suggest this feature right now, that would be awesome

Refined Storage has a feature for it, basically it registers the fluids with the required amount into the recipe and gets the fluid from the registered providers (fluid cards, fluid storage buses) on the network. Interesting solution but I do not know if it would be work with LP...

Covered by Crafting with fluids as results in https://github.com/RS485/LogisticsPipes/wiki/Feature-Requests