Thank you for quick response. That helped. Looking at startup file size I was assuming that add-ons will be included in the template too, but it seems like it is not the case. Anyways I've got this up and running and happy with this template!
Hey Sergey, thanks again for bringing that issue to my attention. I have some good news, I finally found the code I needed to get the add-ons to pre-install. It's not in the documentation yet, but I found it in a bug report while I was googling trying to fix the issue.
So, from now on you won't have to manually install anything, and, if you want to test it out, I added two more add-ons that I've found really helpful: BleuRaven's Blender for Unreal - tons of export options, and BlenderNPR's AbNormal - for editing normals to achieve better results with cel-shading and cartoon-style rendering.
Thanks, take care!