First, let me say Oculus Gallery is my favorite video player. I tried them all and OG is clearly the smoothest one with a completely stutter free playback which i love. But there are still certain things that keep it from being perfect, in my opinion.
1. a 72hz option for all videos (i find it still plays 60fps vids @ 60hz, which can make the image quite flickery at times)
2. some sort of IPD adjustment option (certain videos cause me eyestrain, which is really annoying)
3. basic image/video manipulation features (for changing contrast, saturation, dimensions, various playback aspects etc)
Add these things dear Oculus, and you'll have me hooked for life. Your native player is a precious little piece of software and it's more than worth enhancing it as much as possible.