some suggestions

[hdarren]

A “reflection-amount” channel to control how strong a particle reflects the environment (if “use environment reflections” is turned on ) would be realy usefull too, maybe there is already a way to do that ?

I would suggest using the Output controls on the Bitmap Texmap you are using as the environment map. The RGB Level should allow you to arbitrarily scale the power of the environment.

[hdarren]

Ahh, i see now. That is not an unreasonable request.

[hdarren]

That’s true, it actually never occurred to me.