a) Is planned, will be available when the conversion to XRC is finished. However, we're having problems on that.
b) The autohide isn't planned - however, it can be implemented by deriving a class from wxNotebook which would implement dev's behavior (auto-hide on demand, close button). If you can help us implementing this we'd really appreciate it, since auto-hide is a feature we've been asked quite a few times.
c) We're having problems with the toolbar on windows. wxToolbar is _VERY_ primitive - i haven't found a way to implement multi-line toolbars on windows with the wxToolbar class, and AFAIK, there's no way for a frame to have two or more toolbars at the same time.
So we've had no choice but to wait until dockable toolbars can be implemented. If you can implement a custom toolbar-like class, we'd also appreciate it.
Sorry to say this, but we're as frustrated as you are.