What a much nicer post than the parrallel thread going, a small set of features that does not radically change the game for everyone, but is QOL fo Player groups. One advatnage of the proposal is we can do away with (xxx) in player's name, understand it is needed for member recognition but it is horrible to see.
I very much think that players should be able to associate with a NPC minor faction when allied. In many ways, it word lessen the impact of player group tags if everyone could tag themselves with their (current) favourite minor faction - obvioulsy need to be allied and stay allied, tag removed if not allied.
Should tagging be added, I think gating of the tag for the player groups (and any associated minor faction) along the lines proposed by the OP would be required, getting allied can be a simple as a few hours in a RES site so not an proper gating mechanism. On another note, handing over admin control, and reversal of a player group back to an NPC minor faction, needs to be added to the proposal. Space Poultry and "Aulin War Eagles" (sorry to either if it is not the case), but as it stands through the proposal, no-one could adopt them, or join them. Whilst hardly the most meaningful of content, witout this aspect of management, we risk "content" being behind a wall, with no gatekeeper, from a player group non-fan point of view. In other worrds, I hope this is not a stepping stone, and you are not going to ask for group decals and other walled of content once you get the wall. I have already seen the slippery slope, originally "no" to player groups, then they got given control of controlling faction (I still have not forgiven FD from placing Contrail in Anlave), and they have the ear of the community team - a link into FD that other players do not have. This slippery slope, really concerns me, made even worst as I techincally paid for "god like powers", which I percieved to be ability to feedback to FD, in the Kickstarter, being replaced by Player Groups is probably part of the reason I am so anti them.
Once you get your feedback, you should post in the suggestions area, perhaps this should have been there to begin with as, community feedback to a proposal from a community member is the purpose of that area.
Simon