I know this post is old, but there where no comments so I thought I could help.
Sugar gliders being illegal in Norway, I do not have them. But I do think I know some answers.
So, about the "friendly" question... I just searched, and it seems that at least some suggies like a nice, gentle chinrub or stroke beneath the eyes. This to me seems very likely from my experience with both sheep, goats and chickens (at my friend's farm, visit it as much as possible) , probably more animals to, but can't think of any right now. I have lost count of how many times I have calmed down or even tamed an animal by gently, gently, gently stroking their cheeks. Of course, there are always individual differences.
My impression from research is that once your gliders are bonded to you, they often will sit on your shoulder and other body parts as you walk around if you maintain the friendship, and that is, many of them seem to, not all. I've seen plenty of youtube-videos where they pearch there.
And of course there is carrying them around in a bonding pouch.
And since your thinking about getting gliders, I thought I could give you one tip you did not ask for; IF Norway FINALLY allowed gliders, I would get four. the reason is that if one has to be seperated from the others, goes back to the colony and one of the gliders does not exept him/her back, one can put them in to pairs, and nobody gets lonely, sick and depressed. How many gliders you choose to have is of course none of my buisness, just thought I'd mention it.