The polling intervals are global to the application. This was an intentional design decision, mostly to enable us to feed the data from the same poll to multiple gadgets. For example, if you have the same interface represented on six different gadgets, the interface is only polled once per each polling interval instead of six times per polling interval. The end result is that it minimizes the load on the device, and helps to maintain consistent data across the entire app.
It shouldn't cause any harm to poll every device more frequently in the cases you mentioned anyway; "too much data" is a good problem to have =)
Hope this helps.
Thanks Floyd. Not the response I was hoping for but yeah, increasing the frequency of polling on the "other systems" shouldn't hurt me too bad.