Your comments

Why was this downvoted? Keeping the standard packages in synch with the corresponding TextMate bundles is something that I expect is done anyways.
It is pretty confusing as it is now. I don't know of any other editor that behaves this way. Please change it.
Install the DocBlockr plugin. It gives you exactly that functionality and more.
Yes! Please add an api to do this. I was bitten recently by a plugin disabling standard functionality by overriding a mouse mapping.

With an api to introspect all mappings, we could for instance create conflict reports that shows when the same binding has been used for different commands.