Noticed a quirk that I can't se reported elsewhere. If you activate your torch whilst still attached to your bag, it works locally, but the torch light does not appear to shine for nearby players (with the exact same modset). Subsequently their bag torchlight does not show for me.

Grabbing the torch into primary/secondary will relay the light, but that uses up the whole fun! Reckoning there's a packet relay missing for this in multiplayer, as I'm not sure the mod needs or uses one for other features.