Good suggestions, dong. And no surprise there.
I have a few thoughts.

• A formalised, public ban/ban notification procedure - Banned ID's or members with ban warnings are indicated either in a sin bin type forum and a simple cause is given under their IS - Member>Banned - Trolling/multiple accounts etc A workaround for underage bans if felt absolutely necessary. No more information than that need be provided.

I'm not sure I see why ban warnings should be indicated, but still ...

• Moderator votes on bans could be published? It would aid transparency. Addresses the key issues raised recently.

By name, or merely numbers for and against? I think this might be going a bit far, in either case.

• No gallery access/upload for non paying members. At all. If the gallery is to be paid for that's fine but then non paying members who don't use it should not be made to feel second class because their contribution is 'merely' verbal (well, OK - written). That has wrankled! Pictures are not the sole raison d'etre for LPSG.

Two ways (at least) of looking at this. Do you mean they wouldn't even see the thumbnails? Because the thumbnails might be incentive to become a Gold Member, and doing away with that might damage the financial interest of the owner. (This is, at the end of the day, a business.)

• A process whereby members (probably paying members) may seek the removal of or request an explanation from moderators whose activity considered by a group (12 say) to be partial, spiteful and/or vindictive. Again, open to abuse but...

Interesting, but very open to abuse, as you say. Worth looking at.