Opengl Scene Handling

[k4pran]

I think it would be good to get some ideas about how opengl should handle running / rerunning scenes. Given that it has a gui and interactive mode there is a bit more complexity and I think it would be good to be clear on how the config options should interact with scene selection. Here are some scenarios

1. The -a flag denotes that the expected behaviour is to write all scenes. Should this be outside the scope of interactive mode / gui?
2. When a user selects multiple scenes in interactive mode, does this make sense in interactive mode, outside the gui I don't think there is a current option to cycle through the selected scenes, I implemented a while ago the behaviour of rerun to go to the next selected scene, but this isn't exactly rerunning.
3. If a user selects specific scenes with the gui, should only those scenes appear in the gui dropdown selection, otherwise there isn't much need for a user prompt when the gui is enabled? I guess they can still select the initial scene, but multiple scenes wouldn't make sense here.

Maybe there are other scenarios too that I haven't thought of, but I think it is mainly the behaviour about interactive mode and rerunning that feels awkward with some of the current options