Lemming8 I really like Flarum and the extendibility of it, but it would be really nice if the custom CSS would also be loaded on the admin Dashboard.
I believe the reason this (and the custom header / footer) isn't applied on admin is that if you set something that breaks your site, it would be a pain to recover from it. Css added via extensions should still apply I believe
Lemming8 Another thing is giving a group permission to manage members allows this group to give the admin role to themselves? is this how it is supposed to be?
There's an open issue for this, it's planned for this coming milestone.
Lemming8 A nice feature to add to the groups would also be re-ordering them
That's true, might be a good thing to look info after stable.