It is possible to expand this plugin with the following options:
- Reject or accept based on Steam Community Level
- Reject or accept based on a specific Badge Level
- Reject or accept based on Steam Join Date
- Reject or accept based on Subscribed Groups
- Reject or accept based on Friends
- Reject or accept based on number of purchased games
- Reject or accept based on estimated value of account (price of items)
- Reject or accept based on total playtime in all games
- Reject or accept based on a specific achievement
- Reject or accept based on owning/wishlisting/following a specific game
- Reject or accept based on achievement unlocked ratio of a specific game
- Reject based on Community Ban
- Reject based on Trade Ban
I may add some of this features to the plugin if enough people ask for them.