I would like to create a tap device, nothing to do with OpenWrt operation, just for my own messing about, however I know only two ways of doing this one being tunctl which I couldn't find in OpenWrt, another using the ip command, but OpenWrt ip command is via busybox and I guess that hasn't been compiled with tap support. I was looking for uml-utilities (some distros ship tunctl as part of that) but that doesn't exist in the package index either.
I was able to include kmod-tun in my firmware using the image builder as there is a package for that, but I guess that's just there for the likes of hostapd, or OpenVPN which may want to use it.
So how can I create a tap device? The equivalent of:
ip tuntap add mode tap dev tap0 user nobody