[SolGarlic]

WOW!!!
Thanks! and If I have any issue I will report back!

UPDATE:
OK, tried it but apparently didn't work:
logged in as root (didn't need to use "sudo su")
Moved the folder to the correct location (including the subfolder) and "chmod 755"everything (noticed now that the scripts in "resource" are still 777. Should this be the problem? - UPDATE2: changed and keeps the same)

Created the group and added "xbian" to it. Using "top", it was xbian that was creating the processes.
Should I also add "root"? I noticed now that "root" is the one that started transmission-daemon. (UPDATE2: changed and keeps the same)

Then I changed the init.d scripts for sickbeard and transmission. It should be enough to try, and I only use one more (nzbget) for which I didn't find the correct location to make the change.
Just made sure both modified scripts had the "$RUN_AS:$GROUP" like you mentioned.

And then after adding the two lines in the end was easy...

But after the "dim" screensaver starts, both processes continue running...
I suppose they should be stopped, right?

Anyway thanks again for your tutorial and help.
I really hope CurlyMo integrates this with the download package!