"But some of what you are describing may be better organized by Groups, like you mention "First floor doors", but probably for styles you would not normally want to have special looking doors just for the first floor. If you wanted to have some structure that had something like "All doors" with "First floor doors", and "Second floor doors" as children of it, that may be something that will work better with using Groups to organize them and hide/show/select them rather than using styles for the organization method"

Well I use colors (materials) to separate my meshes
For example all the door frames have the same material (separate objects, different geometry, but same mats)

I divide all the scene like this
So having layers only in groups would be kinda difficult for me to get used to

Thanks for the toggle script, it works great !

Do you have any timeframe for beta 3 ?