multiple cRIO relay (solenoid) modules?

[Alan Anderson]

The FRC control system includes a cRIO relay module for controlling pneumatic solenoids. The documentation refers to "the" module and specifies that it goes in slot 8 of the cRIO. It provides eight outputs, which is enough to control four dual solenoids. Our team's early robot design looked like it was going to far exceed that number, requiring us to use Spikes for some solenoids.

I did some checking/hacking/experimenting and determined that the system supports a second relay module installed in the otherwise empty slot 7. I see only one rule that might potentially apply, and it doesn't restrict using extra modules. Before I ask our TIMS contact to ask about this in the Q&A, does anyone else know of a reason it wouldn't be legal?