Also, an easy ability to add in permission-purchase to the purchase wizard, and making that run after a CMS action happens where bypass-validation permission was not present.

i.e. you define products that say "if someone adds this, and doesn't normally have permission to, take them to make a purchase for that permission immediately after adding it".

The architecture for this was done in v8 (the booking addon uses it).
"purchasing [esp. subscribing to a paid usergroup]" is added for v9.

"entering quiz" is not that interesting. We can specify a permission on the page, and have guests have to join, then get redirected back.

I have just turned on automatic-login-after-joining for the case where the confirmation code is not required.

Separate newsletters may be dropped. If not, we can send newsletters to usergroups anyway - so no need to complicate this. We can invite people to join newsletter-receivable groups at joining too.

Therefore, marking 'wontfix'.

Actually, this kind of was implemented - so I'll mark 'fixed'.