This site is not suitable for feature requests or discussions. If you want to discuss usability issues, then things like the Ayatana mailinglist is more suitable. Or you can file a bug on Launchpad.net.
The first thing I would like to do, is to recommend that you start using your thumb to press super. That way, you should have at least easy access to the first few numbers. I would also like to thank you for making me have a better look at my keyboard (It's new). It turns out that it has a second super-button on the right hand side of the keyboard, and I find it to be completely useless to switch between applications the way you describe. I also tried using altgr, which is right next to the spacebar. It was just as unusable. The reason is simply that I don't have an opposable pinky. It may be useful if I use the left hand to press the numbers, though. It's certainly useful to launch the dash.
It should be possible to use xmodmap to achieve your goal. There is also a GUI for it somewhere, though I don't remember what it's called. But be aware; it is possible to configure it to be identified as a certain key without it working the way you want. If I recall correctly, you need to use the kaycode and not the symbolic name. It may be the opposite as well, but in any event, it is worth checking out.