Hairshader and dynamic lights

Is there a way to disable dynamic lights for the hair shader to avoid that a dynamic light in the front of a player would brighten the hairs in the back without the requirement to make all dynamic lights casting shadows (which could be a serious performance hit with a lot of foliage)?

To demostrate what I mean I’ve made a few screenshots made with the 4.11 content example:

Original (many different lights):

Removed all lights except the static pointlight in front of the hair.

Still the same pointlight in front of the hair but switched from static to moveable and increased the power to demonstrate the issue.

Same pointlight again… but shadow casting turned on. Seems to work, at least if you split the hair into lot of pieces and you like that your dynamic light may cast shadows (everywhere).