Disable Canvas during loading?

This is another issue stemming from the pokki environment. Larger HTML5 apps may take "some time" to fully load all the media files before the Canvas is rendered on the screen. In normal browsers, we can see this happening during the HTML5 loading screen. However, tn the pokki environment, the HTML5 loading screen with your default logo doesn't display during the loading, only a blank screen is displayed until the canvas is actually rendered (yeah their stuff is a bit wacked).

So is there a way we can disable the canvas element until all the media is loaded, while displaying a custom HTML image/message in place instead?

I don't know, isn't this a problem with Pokki? We have tonnes to do already and a massive todo list to work through with a small team, so if at all possible I'd prefer to avoid fixing problems in other people's software.

Is there a callback for "finished loading"?

I can see that being useful.