Feature Request: Slash commands for mode switching

Shift+Tab works great on my desktop. However, I like running Claude Code in a tmux session so I can SSH in from my phone and keep working on stuff when I'm not at the computer or not at home. This works pretty well except that most android terminal clients and most android keyboards do not allow inputting shift+tab. The only combo I've found that works is Unexpected Keyboard and Termux, but everything else about them is subpar.

If there is a way for me to do this in a custom slash command I would happily just do it myself but so far I've not been able to crack this nut.

Thanks!