I have been looking for a way to control my scanners via iPad (IOS) and I already use FreeSCAN but, in addition to yours, I was wondering about a bit different approach...
Using a serial to WiFi connector (such as here: http://www.serialio.com/products/mobile/wifi/WiSnapAAA.php
) you could control a single scanner over WiFi on a single IP. On the other hand, you could control multiple scanners via multiple IPs. This would allow a mobile setup as well as a home setup.
I design a lot of embedded electronics and write a lot of embedded software (both professionally for over 20 years) but never for IOS. If this is something you would like to try as a joint venture, I would certainly be willing.
Just a thought but I believe many people would really like this approach as well as your current one. I envision a small interface that would handle multiple serial connections with a single WiFi (b/g/n) "access point" that the IOS or any other computer for that matter could talk to. I am sure I could design the electronics to fit in a box no bigger than the size of a small access point... In fact it would look much like an access point with multiple DB9s.
Anyway, let me know what you think.