If they can make anything, how about this:
Adjustable WATTAGE (only needs a few settings such as 6, 8, 10, 12) with a simple color changing LED to show current setting.
OR
Adjustable WATTAGE (with more settings such as 6, 7, 8, 9, 10, 11, 12, 14) with a VERY small display (lcd not LED?) so it doesn't make the whole thing too large. It COULD be adjustable to a tenth of a watt (i.e. 9.2) but that wouldn't be necessary if it's going to make it significantly more expensive or larger.
Ideally the wattage would be adjusted without the need for a screwdriver, either by button or thumbwheel.
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In a nutshell, I'd like to see things go away from the 7" long tubes. If the atty/carto is mounted inline with the battery it starts to get real long. I'd rather it by beside the battery to keep the length down.
If you're really ambitious, make a hinged piece that gives you a side-by-side configuration with the button on top next to the mouthpiece. BUT, and here's the beauty, the connector piece could swivel 180 degree so that it's inline with the battery, and thus becomes a bottom button configuration.
Here's a rough, quickie, drawing since my description is poor: