User-agent:
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.21) Gecko/20110831 Thunderbird/3.1.13
Maybe we should find a way in the middle. I mean: if you want a secure
system you should make installation of ppas harder. If you want a system
which can be easily extented and is very end-user friendly you need a
easier setup for ppas. So wouldn't it best to check the ppas and give
them different rights. And the checked ppas get an "easy to add link".
An other solution is updating software more often by the official
sources and providing a better structure to add new programs and
commercial content which is free, cause it's strange to find programs
for $0.00 at the to buy section.