Currently Lockdown is crashing on SMP with this crash report: http://pastebin.com/a2PdnZ2X

I've talked to you through IRC and have reported this issue and SMP support might be getting implemented at a future date. Just making this post here as a reminder Post and as Written Documentation.

I do agree. It's annoying to have to reboot the flamin' thing so many times.

Please mark this mod as a client side mod in your manifest, so we don't have to start up server 7 times to weed out all client mods.
Just add "ModSide: CLIENT" to the manifest via gradle:
Place

manifest {
    attributes 'ModSide': 'CLIENT'
}

inside the jar block.
Thanks.