Hi @tupper
First I wanted to say thanks to the VRC team, for finally focusing on the community more by implementing requested features and going into dialogue.
Then I wanted to suggest a few things regarding the new features:
Local Mirror
Would be nice to have quick and direct access to it, without going multiple pages through action menu. For example on the 1st page of VRC hand menu or some kind of Quick Menu (see below).
Just imagine a performer, who needs the action menu for avatar toggles and has now to switch between the options / mirror menu and the avatar expressions menu back and forth ! Like - I already grew tired of it and its just in Beta. Please hear us out on this 
Quick Menu
You probably know it from the UIExpansionKit - a customizable extension below the first page of the VRC hand menu. It just needs a small “edit” button there - to select buttons / toggles from a list. Very, very helpful for people who need to quickly toggle certain things (mirror, avatar hider, speech bubble, …)
Avatar Resize
You had concerns regarding polite chat behavior. So what about defining upper and lower scaling boundaries for players, managed by the safety system and connected to their rank. Also it should be really easy to implement (there is a mod) and it will save a lot of resources on content server (dozens of avatar versions in different sizes).
Also as a content creator - it is really annoying to maintain like 3 different versions of the same avatar, just to have different sizes. So please, hear us out.#
Would be nice to get a short response.
Greetings, Rei