I’m noodling on using imagebuilder to take stuff out of the firmware for my Mango. My candidates at the moment are the mac_vender.db, gl-tertf, nodogsplash and probably the openvpn server. I can free up a fair amount of room by deleting them from /etc, so at the moment it isn’t urgent. I’ve added in luci, adblock, nano and sqm.
I definitely do not want DLNA or fileserver in my device. Those are far from desirable in a travel router.