Hello,
As far as the delay in response: We always answer our regular support requests before forum requests - this is by design, as the customers who pay for support get preferential treatment. If we are short-handed, as we have been for the last week and a half (due to a Qube Certified Administrator class in Los Angeles and various on-site visits), the forum topics may seem to be ignored. That's not the case, there's just an order of operations, and the forum is at the end. If you/your company is up to date with your/their support contract, you will always get faster answers by emailing support at pipelinefx.com.
As far as needing a license for Maya rendering: Maya does not use a license for rendering - this is true of both command line and jobtype based rendering. Only the renderer is licensed. Maya is only licensed when an interactive session is opened, and Qube will never open an interactive session (it doesn't know how to do so).
As far as a vrscene stand-alone submission UI: Aside from this one, we've only had one other request for such a feature. It is on our roadmap, but it's fairly low in priority, simply because there hasn't been a very compelling case to create one. That said, this makes for a second request which will bump it up in priority. In the mean time, a generic "cmdrange" submission UI will render a vrscene file. That said, I can understand that populating the "cmdrange" submission UI by hand may be tedious, especially if you don't have developers on staff to script the population of the generic submission UI for repeated use.
To summarize: Maya does not use a license for rendering, so there is no need (at least when it comes to licensing) to render vrscene files - simply render from Maya with Render Globals set to use Vray through the Maya Batchrender or Maya Render in-app tools. Only vray licenses will be consumed.
PS: Qube can also keep track of the number of vray licenses in use so you will never overrun your license allocation, regardless of the number of jobs wanting to use the license. See
http://docs.pipelinefx.com/display/QUBE/System-Wide+Resource+Tracking for more info.