I'd really like such a feature...
The sensors could be connected via BT and the data logged.
And even better:
One could have features that do dynamic air calculation,... e.g. the OSTC could more or less accurately calculate the current SAC and based on this and the current scheduled deco stops + some configurable safety margin (e.g. 1/3 rule, or e.g. "want to leave with 50bar"
tell the diver how long he could stay at the current depth and still get out (after that time) properly.
I.e. a FTTS with air ;-)