Quick access to frames in casts could be powerful:

@dwr.eth -> user
/dwr -> channel
$eth -> assets
+frame -> frame?

Other related idea is while $ works for tokens, there's not a great generic contract address standard. Frames paired to contract addresses as a default UI could be interesting.

@ $ / all on the main keyboard

+ requires 2 clicks on mobile 

! is still available :)

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Maybe a difference between iOS and Android (and probably for various keyboards available on Android - this is the default GBoard on my Pixel phone)