Why dont add a node ( like the vray properties in max) who the user can chose if the material emit/receive GI or not, it result a faster render with transmap hairs and transmap lashes !

not only for hair.

i will give an example. in reality lights are brighter then 1. thats why we use HDRI images. but we can fake it in poser. lets say that i have a big box in my scene that represents the light source. it will be reflected on my reflected materials. but in reality the box would be brighter then 1.  so i would set the ambient to  3 or 4. now the reflections are better. now comes the problem. when i use IDL it will look up the white box and it will add extra light. if i have ambient set to 4 then IDL will give us even more extra light. 
its IMO a problem.

so if it is possible it would be great if we could turn of IDL on specific materials.

Quote - Why dont add a node ( like the vray properties in max) who the user can chose if the material emit/receive GI or not, it result a faster render with transmap hairs and transmap lashes !

HI what you are describing is a "compositing tag / node"
Most high end renderers have it because many CG pros prefer to render out scene element in separate passes for Shadows , specular etc.
Especial for animation Comps.
something like this might show up in some future version of poser PRO but IMHO is not likely to be seen in the core version of poser as most users probably dont do layered comping in post. 

Cheers