I personally do not care about the channel numbers because my live tv is pretty limited so I use Favorites. But my wife like's channel numbers and she uses the ALL selection and also mainly with the On Now.
So that we can fully test Locast I unplugged my HDHomeRun OTA Box and I told my wife the only difference is that her Local Channels are now at the bottom of the list instead of the top. On Now does not show channels numbers anyway so not an issue. But with so many channels it takes a bit to get to the bottom.
So, if you started these Locast Channels at 5000 (or 5900) instead of 7000 then it would be pretty much the same as before. I assume there is good reason you started everything at 6000. But if there was an option to where to start Locast channels that might be helpful.
In any case adding support for Locast is a great option. Hope they make it past the legal stuff and grow the service.
Thanks for continuing to make Channels a superior service.