Hi Greg,
The Daktronics TV Data feed protocol that is outputted to external devices (like XPression) from the scoreboard does not include power play or penalty clocks in the Hockey game mode. Daktronics would need to add those clocks to the serial feed outputted by the All Sports systems.
There may be a solution using Daktronics DSTI systems but I am not certain.
I know some people who use Graphics Outfitters ScoreboardOCR systems with a scoreboard camera to convert the cameras video capture into a data stream that could be read by XPression in (near?) real-time.
Graphics Outfitters ScoreboardOCR#XPression