Thank you for the kind words!
Yeah, some people been asking for a way to contribute code, but I'm not sure I'm ready to slow down development yet and spend time coordinating, for now I'll continue to publish the source inside the download, so you could at least improve what you really need ASAP. All my infrastructure would need rewriting in this case too, as it's all local right now, which I don't want to spend time on, I much rather make the player more mature first :) I'll revisit this in the future no doubt!
About the seeking, I think you're right, for 3 hour long movies it can take quite a while. A button to hold down to speed up (and also another for slowing down) I think is a great way to surface this, thanks a lot for the idea and feedback, I've noted this down and will include in a future version!
Again, thanks a whole bunch both for the feedback and kind words, helps a lot to make it better! <3