I seem to have the problem on my server where it tells me “No such item” when i try to give myself or another player logi pipes. Everything works fine in single player. I am using a fresh copy of Tekkit 3.1 server files.
I didn’t know there was a port for Logistics pipe in SMP. That version isn’t created by the same people though. So you should probably find the creators of that port instead of coming here.
2. It’s a lot harder to make a mod for multi player. Many technical challenges with syncing between client and server. The server and its many clients must have the same information and being able to distribute and sync the data might require large changes in implementation.
3. Yes. It’s being done. Krapht (and SirSengir) is currently porting both BuildCraft and Logistics pipes for Minecraft 1.3.2 and in that port I think they are adding SMP support.