Well, bees are content from another mod. They're neither part of vanilla Minecraft nor of Thermal Expansion, so there's little reason to support them out of the box.
A better question would be: how easy or hard is it for other mod authors to make their own special item ducts and add them in? Buildcraft made this easy, and several modders (including Sengir) took advantage of this. But Buildcraft has a different development model, and the item pipe feature as such is implemented differently.
A better question would be: how easy or hard is it for other mod authors to make their own special item ducts and add them in? Buildcraft made this easy, and several modders (including Sengir) took advantage of this. But Buildcraft has a different development model, and the item pipe feature as such is implemented differently.