[mehrdadn]

I recall I've had trouble finding good documentation on the equivalent of OpenSSH features in Dropbear. Stuff like restricting the client IP or disabling port forwarding... lesser-used features like these. It's been a while though.

[gelstudios]

The general pattern used by most of these "lightweight" implementations of system software is granular compile-time options for every additional bit of functionality.

https://busybox.net is a good example of this.