I think I expressed myself very unclearly. Maybe I can rephrase my OP.
I do not seek to automatically approve or decline messages, I seek to have an alternative to /timeout that instead flags the message for moderator attention.
I am aware that this interferes with the current way things are handled, since 3rd parties can only flag messages that have already been sent out, while twitchbot acts as middleware before messages are sent out. Instead, you would need some kind of CLEARCHAT-esque command that removes the message from the chat of users until it is accepted (or removed permanently)
It was just a thought that would make this feature applicable to all channels, instead of just a small subset of channels that dont use a proper bot yet.