I have made significant progress with these changes, and it is in alpha/beta testing on my sites:
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Selecting "user custom", expands:
View attachment 285996
AdminCP side:
View attachment 285997
(Yes, supports
@NixFifty's Discord integration add-on)
I plan to add a "XF2.2 preset", and also the ability to setup other default settings. ie "Less alerts" (without reaction alerts). But haven't implemented this yet.
The migration progress is a little rough and I need to test this more.