The desktop file should be there since the first release (1.0.0) which was uploaded to extras. For the first release the desktop file was using sudser. This was no more needed for the upcoming versions because I added a script for the desktop file.

It could be that in version 1.0.2 the desktop file got removed because of a mistake in creating the dsc/tar.gz file. I copied old sources and forget to change some pro file which was pointing to another directory. But my deb file which I compiled on my local machine had everytime a desktop file. For further releases and the future I will use the deb from extras to see if everything is alright.

Thank you, I really appreciate the help from the community. And I am thankful for every hint or comments for improvements. I am willing to make it more perfect and to make it maemo/linux conform.

However I am not a professional and I don't know everything. But I learned many things by reading in this forum thanks to all people who are posting informations, explanations and give helpful answers.

And sorry that there is no good documentation for my application. I think for some people it is not easy to use and to find all necessary option to make the desired configuration. For me it is easy and self-explanatory due to the fact that I created the gui.
I hope I will find the time to create some example scenarios with explanations.

Also if someone has a problem with some scenario he can ask here and I try to help or writing a small step by step tutorial.

@disappear
I am sorry that I not answered your question about iptables but as far as I know your problem can not be solved with iptables It has to be done with filtering some dns inqueries.
However I don't know how to do it with N900. But it is still on my todo list