Already half-done, have already converted edges and hindrances to be draggable onto the NPC "special abilities" list. Could simply add in powers too, although all mixed in the one list might be confusing.
Maybe a new idea is required - add a separate power list to NPCs ? Split NPCs into monsters and human (e.g. those with special abilities, and those with edges / hindrances / powers) ? Not sure if this split is perfectly defined in all rulesets. Even Coffin Rock (adventure for DLR) has humans with a couple of non-human special abilities.
Savage Worlds for FGII
All the ideas and discussions
Draggable Edges / Hindrances to Extras