got some more questions

1. is it possible to turn off the shadows for an object? For example, using environment lights in a closed room with the room not casting shadows.
2. i was thinking of getting the plugin for modo too, would i be able to share materials between both plugins (and the stand alone while i'm at it

3. is it possible to use a hdri for reflections, but not as a lightsource? And maybe have the option to use another hdri map (or regular environment) as light source?
Thanks,
Elele.