[tor-relays] Obfs + Non-obfs bridges

Can a single tor daemon instance provide both non-obfuscated and various other obfuscated transports? Right now, I have one instance that provides both obfs3 and scramblesuit. E.g.,

ServerTransportPlugin obfs3,scramblesuit exec /usr/local/bin/obfsproxy managed ServerTransportListenAddr obfs3 MYIP:PORT ServerTransportListenAddr scramblesuit MYIP:PORT2

I currently have another tor instance that runs a vanilla bridge configuration (no transports) on a different port. Is this really necessary? I couldn't find any documentation that address this. Can non-transport clients use any bridge by simply not negotiating a transport? There is a "none" pluggable transport type, but I figured that was for debugging purposes.

Thanks, Dan