Todd,
I hope you found a solution. It appears that you would need wireless RS-232 serial, wireless networking by itself won't work in this case since I think the Ashly is RS-232 control. There are several RF, Bluetooth or 802.11 devices for wireless serial communications, MaxStream has some 900MHz and 2.4GHz modems. Another option would be a Crestron or AMX solution with one of their wireless panels instead of a tablet PC.
There are many good reasons for controlling DSP devices in permanent installs. It is very common to have AMX and Crestron systems talk to DSPs for presets, routing, room combining, volume control, etc. If the DSP is the only device being controlled then direct communication for these functions rather than through a third party control system would make sense.
I think the problem may be in looking at the DSP as only a speaker processor, which I agree should normally be set and left. However, if a theatre or auditorium may have simple lectures or AV presentations as well as performances I quite often use a matrix DSP to switch between a normal "performance" mode where the DSP uses the outputs of the house console and a "lecture" mode where the system input is from an automixer (external or using the DSP) and the presenter has only basic volume control via the DSP. That way they can run operatorless for simple events, then hit one button and you're ready for a performance using the console. The presets can also address EQ, routing, etc. appropriate for each type of use. This seems to be a good example of where remote control of DSP is beneficial and desired.