Extra-features (disabled by default) is somewhat confusing in #Fedilab.
This option allows to enable features that #Mastodon doesn't support (quotes, reactions, submit messages in a specific format, etc.)
But softwares like #Pleroma, #Akkoma, #GlitchSocial, #FireFish don't support (currently) same features.
We plan to use #NodeInfo to automatically enable features depending on the user's instance (ie: software).