I think pointer lock should be a standard feature considering how useful it is for games.
I think it is weird when us devs have to feel like we need to get Scirra's permission for developing a game our own way. I know it is Scirra's engine, but why does it feel like you're limiting our options here by trying to convince us we don't need it?
The pointer lock plugin was very useful to me when I had been using it. I haven't used it recently, but if it is broken, then that sucks. We need this feature. Maybe not a high priority, but it is very useful and good to have. If scirra doesn't implement it, then I would hope someone else creates a working plugin.