Skype multiarch on AMD64 build

Hi everyone, I´ve been building a couple of isos and I noticed that Skype is not appearing in the system. I also added some other .debs as well as packages into the package lists without any problem.
I think that the issue might be related to the skype package being a multiarch deb while all the other packages are specifically X86-64 ones. Any ideas?
Also, how can you disable a certain service in the live dvd. I added nomachine´s remote desktop and I see that the server is starting during the live session, I would prefer to disable it by default and enable it only when required.

Thanks in advance.
Alex