What's "envro" ? What's "ffff" ?... Please, use understandable terms !!!
I already replied about the draw distance (see my previous message).
I don't see what you mean by "adjust avatars fully rendered"... Avatars are either fully rendered or visually muted (use the (un-)mute feature for the latter: it's in the pie menu). Period. No need for any setting...
Windlight is not something I'm using (in fact, I set the sun position to midday, always... I personally find Windlight a useless feature), so I'd even less consider wasting precious screen estate for adding settings related to it in the toolbar !
Please, remember that the Cool VL Viewer is just my view of what a viewer shall be, for my personal use and purposes. I'm publishing it for other, like-minded people to enjoy it, but if you are not like-minded, you'll probably want to switch to another viewer which will be more suited for your own needs.
You can of course make suggestions about improvements, but if I don't deem your suggestions as interesting or useful for me (i.e. for my own use), don't expect me to implement them.