Disclaimer: I am a Mozilla Rep. When you face this kind of issue there are some quick ways that you can reach us for feedback and issue solving:
1) You can write to app-reviewers@mozilla.org 2) You can talk on IRC channel: #app-reviewers on irc.mozilla.org
The IRC is the best option in my opinion because there are always a bunch of people there and its quicker to talk to a human than to exchange emails.
Some marketplace tools are still evolving and its only getting better. Whenever you find false positives or bugs in the app submission process, you can fill a bug report on bugzilla. People will notice and act upon it.
Also remember that the Firefox Marketplace is not your only venue for distribution, you can distribute your app on your own site using the Open Web Apps API (http://wiki.mozilla.org/WebAPI). This API works well for hosted apps and even though it is documented for packaged apps as well I am not sure it works for privileged packaged apps yet.
Firefox OS is a great system with lots of potential and Mozilla is more open about its processes than other vendors. I hope you stick around with us and keep developing great apps. I am sure your RSS reader will be aproved soon, can't wait to use it (and I like the flat version more than the previous one).