First impressions of your software was really impressive, and just a few features would be needed for it to replace any other players i have tried.

Option to use Frame Interpolation: VR comfort is improved with higher framerates and for video's in VR even 60fps is very noticable, especially on desktop HMDs due to their low persistence displays. A feature i think would be great for this, but i have yet to see in any video players is Frame Interpolation to smooth out the frame rate. - This would benefit sub 60 fps videos the most, but even pushing 60fps videos up to the HMDs 90hz rate would probably improve the experience in a lot of cases. - This could also potentially help set your software apart from competitors. :)
Super Sampling: would help to reduce aliasing artifacts in both videos and the scenery in the application in cases where people have the hardware to run the software at higher resolutions.
Cleanup or incognito mode: For those users who like to enjoy "Gentlemens Special Interest" content in their HMD it would be great to either be able to completely clear the auto generated libaries (such as "VR videos") and/or to go into some sort of incognito mode where the software does not catalog items. Either this or to mark certain folders to not be catalogued.
Sorting options: Would be really usefull to be able to sort folders by last modified date, to find the latest downloaded content in a folder for instance.

Hope you take some of these options into consideration.

These are primarily suggestions for PC/Desktop VR, but could be relevant for other platforms as well.