There should be an easy way to add a living person to a family group tree!!

I'm a tech person & can't figure it out!!
When I'm logged in, FS knows
1 Who I am
2 What private fam tree groups I belong to
3 What private fam tree groups I am Admin for. Often only 1!!
Suggestion-
When I'm in my PRIVATE family tree, TREE VIEW and can see living/private persons,
Clicking on 'Living' opens dropdown box to add person to private fam tree group. Obvs, if I'm in only ONE private fam tree group, that's the only one that appears.
At the same time offer to add the person to SEE the group, or to be an admin for the group, eg by adding a phone # or email.
*****
AND
When I'm in my private family tree, PERSON VIEW and can see living/private persons,
Clicking on SOMETHING (should NOT be a checkbox or other T/F, because we might want to add the person to MULTIPLE family tree groups)
opens dropdown box to add person to private fam tree groups. Obvs, if I'm in only ONE private fam tree group, that's the only one that appears.
At the same time offer to add that person to SEE the group, or to be an admin for the group, eg by adding a phone # or email.
*****
Or even add a tab to the 'Living Persons' pages.