Re: How many people would be interested in this light if it were to exist. Spot Flood
My 2 cents here
Since a flood is easier to achieve than getting a long-throw spot, I'd vote for using a beamshaper-type arrangement as well and just concentrate on getting a good spot first.
All else being equal, we all know white LEDs don't do as well as the cyans, greens and some shades of blue in the long-throw area. And for most practical purposes, accurate color rendition becomes less important than outright visibility for long-distance viewing.
So for a nice combo light, I just opt for 2 luxeons in a flashlight head - a cyan/green 5W (for spot mode) and a 5W white (to be run simultaneously with the cyan 5W for flood mode edit: AND spot mode too...).
Having seen the McGuchie Greenie aka Terra Destroyer in action personally, I can tell you a green 5W puts out a LOT of light and throws like crazy!
The white 5W is thrown in ONLY to fill in the gaps in the spectra left by the cyan/green and to ensure that all colors would be visible for good all-round utility (like map-reading) in close-to-medium distances.
The light would be set up primarily as a spotlight and "flood" mode is solely "activated" by attaching a diffuser (eg. beamshaper).
The 5W cyan would sit in an optimal reflector arrangement and it would be adequate for the white 5W to be inset somewhere else within the same reflector (similar to the A2). If possible the white 5W would be collimated (acrylic ball maybe) even within its inset position (yes - this means you might need a turbo-head sized reflector).
Its by no means ideal, but IMHO, the above design could yield a compact (M2-size if you like 123s, 2C Mag if you prefer regular batteries) and extremely useful combination.