Building Item filters / tags

Thought it might be an idea to have a general feedback on the filtering/tagging we have on the building items. And I don't mean the bug/annoyance where it forgets your selection.

I'm talking more about things like:

1. Material tagging seems a bit over-specific. I wish there were more general terms for wood , stone, metal, etc.

2. wish there was a filter for 'fully rotatable items'.

3. wish there was a filter for 'colourable (not even a word!) items'

Any other ideas?
Some more:

4. filter for 'pieces used in selected building'

5. filter for 'pieces used in this park'

6. favourites capability, and appropriate tabs/filters to show favourites