I just went through this, and its prolly the shitiest part of innerspace and it could really use some work.

Two things, you have keymaps:
Keymaps will pass without regard to "repeater/ broadcast" no matter what.

Repeater:
Repeats keys, that are not on keymaps when in the on state. So do like a Mute, you need to toggle repeater off, keymaps off.. then you can type for one person. If you want to type like a password in for your all your stuff I do all the keymaps off, and repeater on, then all keymaps back on and repeater off.