Although I don't have much experience with the WiFi units (primarily just the ethernet units), it should operate essentially the same.
The v1.9 module provides for real outlet status feedback (output: OUTLET_STATES(x) ) that could be taken directly to the touchpanel feedback input.? Polling the module will update this if necessary. I'm not sure that it even needs polling for update though I haven't messed with it recently...
If you're using an INTERLOCK symbol for the feedback, driven by your touchpanel button presses, the outputs of the symbol are all low at program start and will only be raised when an input is triggered.
I would try bringing signals directly to/from the touchpanel to the module and see how that behaves...
