Hello and welcome to the Flarum forums!
1. There is BBcode and I think all BBcodes are supported and it will be possible in future releases to see the buttons;
2.Again in future versions or with an extension;
3.No, but why need that when you can do it right on the front-end, as a moderator or admin you can do all of those from the front.
4.You can create groups yourself and give them moderator permissions, but a moderator group is already present on install.
Hope I helped a bit ?
