Just thought i'd provide the engram entries in the event people wanted to disable certain arrows from their server like i have done with the drain and harpoon arrow. I've included the code for all three arrows.

Tranq Arrow
OverrideNamedEngramEntries=(EngramClassName="EngramEntry_CompoundArrowTranq_C",EngramHidden=False,EngramPointsCost=0,EngramLevelRequirement=0,RemoveEngramPreReq=False)

Drain Arrow
OverrideNamedEngramEntries=(EngramClassName="EngramEntry_CompoundArrowDrain_C",EngramHidden=False,EngramPointsCost=0,EngramLevelRequirement=0,RemoveEngramPreReq=False)

Harpoon Arrow
OverrideNamedEngramEntries=(EngramClassName="EngramEntry_CompoundArrowHarpoon_C",EngramHidden=False,EngramPointsCost=0,EngramLevelRequirement=0,RemoveEngramPreReq=False)