@dwr.eth Have you seen any tool that allows a user to cast to several Channels simultaneously? 
…even if it’s limited to 3-5 max. 
Or would you allow it natively?

This is a good idea. At first glance it might sound spammy. But what if cross-casting is actually a great way to discover channels and users in them?

Cast 5 channels, and there’s likely to be some overlap of channels and users, with some diff too.

The diff becomes the recommendation “engine” for social growth.

Co-founder XMTP, building web3's secure messaging layer ➡️ https://xmtp.org

isn't this already possible by forward slash tagging multiple channels?

building /fluidkey // moritz.fkey.id // thoughts at moritz.ooo

You can link in in the cast but only one channel per cast in terms of where it appears.