I think is a good idea, especially if you have any females, breeding gliders is a lot of work and so much more stressing than neutering.
Fortunately for me, I did not go through so much stress since it had all been set up by my breeders, who had never experience major issues with neutering, and I also got to talk to the vet about the procedure, which made me feel a lot more comfortable about the matter.
Have you talk to the vet that will do the neutering? Anesthesia is done according to weight, many vets have a minimum weight they require in order to do surgery, if your little one is very little you may have to wait until he has gained some weight. It's better if he is above the required weight the vet accepts, and will create less complications and worries about anesthesia. For some gliders, anesthesia gives them nausea and they may throw up some once they wake up, but that is no reason for alarm, it is NORMAL. Just like humans, do not feed them anything in the morning that they are having the surgery if you want to lessen the possibility of them throwing up; still feed them as normal during the night of course, just, no snacks in the morning as some people do.
Your glider will NOT hate you for it, they are not really capable of such a thing. Many gliders don't even realized they've been neutered. They may clean the area of the surgery but don't immediately think is SM, they are just licking off the stuff vets use to clean the area, which to them is weird. Unless he focuses only on that area, and even takes the stitches off (if there are any stitches) there is no reason for concern. There is no even need of putting and e-collar or e-jacket on them, that usually only stresses them out; of course, it is always good to have one handy for any emergency, not only SM.
Neutering will help with all the reasons you mentioned: fighting, dominance, and stench. If he still hasn't sexually matured, he may never develop sexual interest, and in the future, if housed with a female, you can avoid having mating wounds done to her because of it.
As for introducing him to your established glider, just follow the recommended introduction methods, and if you have any questions post them in here, I am sure someone will be able to help you.
As I said, the most reassuring thing, at least for me, was to talk to the vet. If you don't feel comfortable with him/her, just find one that does. Though it may seem like there are many horror stories about neutering gone wrong, those cases are really not as common as you may think. Example: my breeders have probably neutered over 50 gliders in the years they've been breeders and rescuers, and the only gliders that had exhibited signs of trying to SM (they did not succeed in SM, because my breeders had e-jackets in hand) were gliders that already had a past of SM, and even they were fine after the procedure and some monitoring from my breeders.
Hope my rambling was helpful at all.