Have you searched for similar requests?
Yes, find some mentions, but not exactly this.

Is your feature request related to a problem? Please describe.
For the chat ST is already simple the best, IMHO. It's so good, that I want to use it for the writing stories - all these features with WI, regexp, and so on, is very useful for it too. And I found setup and model that actually good working for it. But with minor problem: to be good story writing solution ST missing one feature: Easy way for user to constantly start next message as {{char}} and then continue it. Right now I can do it this way:

1. Setup character "Writer" with the custom Instruction (it told that ASSISTANT continue USER's ideas for the story).
2. /sendas Writer
   Once upon a time there is
3. Press "continue"

With option <Press "Send" to continue> it's easy to continue messages, but I still need to start every new message with "/send as Writer" and it's somewhat annoying.

Describe the solution you'd like
Option: "Reverse impersonate by default" that will do exactly as "/sendas {{char}}" only by default - on every new user's message. Preferably with another command like /trp to work as it's trigger for this mode.

Describe alternatives you've considered
If regexp replacements can be triggered as /command, I can setup regexp to simplify prefix. ( @w -> /sendas Writer ), right now it's don't work, replaced command will not trigger.

Additional context
None.