At one of the recent meet and greets the devs mentioned that making Fey Slayer imbuable is on the radar. I know things that seem straight forward often involve more than "flipping a switch" but I'm hoping our beloved @Kyronix might be convinced to add this to the next publish if we all ask really nicely and promise to bake him cookies! 
(Sorry if this should have gone in tweaks and suggestions, figured it's crafting related and would be more visible here.)
(Sorry if this should have gone in tweaks and suggestions, figured it's crafting related and would be more visible here.)