Nanode RF connections

Hello all,

I'm looking for some conformation of the usable pins on a Nanode.  I have a Nanode RF SMD v 7.2 purchased from the OEM shop.  The intended use is for remote central heating control and I will be using the RFM12B and the Ethernet.

I need one digital input for direct temperature measurements and three digital outputs to drive Ciseco relay boards.  I have already used pin 4 and 7 without issue.  Reading the pin list at I'm thinking that pin 9 is also available.

Clearly I'm looking for one more digital connection to use.

Are there any other connections that can be reliably used without conflicts?

Can the led pins 5 and 6 be used to drive relays as well?

Thanking you in advance.