Hello frafra,
Thanks in advance for your tips...
First about bug 1... I've been investigating the problem.. it actually concerns about "password". Policykit should be opening a window asking for the password either yours or the root... but it doesn't!
For the same reason your bug 6 happen, since the user created on the installation has no permission the first time you would be asking for an hibernation consolekit would be asking for the root password... and it doesn't
Now the upkg things...
I think upkg needs lots of improvements... but it was written in Mono... and I don't know Mono...

.... but here goes what I know :
1. Upkg was written in Mono but sometime ago the developers were speaking about trying to port it to gnome Vala language... but they didn't had the time to do so
2. Because of fact #1 then they didn't start the packagekit backend but it was in their plans.
3. I think the most annoying think in upkg is the fact of not resuming the download... There could be the resume e then if a md5 doesn't check or something upkg could try again.
4. Paldo needs more devels... so if there is anyone here wanting to help with upkg, paldo installer translation or application specs... I know the developers are willing to join your efforts in
Now about other bugs you've pointed out:
bug: 3 I think pidgin doesn't support officially the google talk option
bug: 7 You need to give us more informations... I use the same module and no problems in here
bug: 11 I don't have this same 3 identical programs, what are them?
I'm not a devel, but I'm really interested in seeing paldo develops better.. but I don't know how to write a code (I'm the wrong architect... I build buildings not pc systems

)
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OSs: Paldo-testing x86_64 :: HP Pavilion dv9680ez