I'm in the process of prepping mine for assembly (delayed a bit because mine was missing the HEAD for some reason and I have try and make one) and I see no reason why it can't be pinned easily if you want to. There's certainly no harm in pinning it.
Also, you might want to try and find that rubberized CA adhesive. It's usually sold at hobby stores and it's black (more like really dark brown) in color. It fills gaps but it's also semi-flexible so it's more shock resistant than most CA which dries kind of brittle. I use it whenever I have something on a mini that I want to be certain will be durable.