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It's my birthday! I'll be releasing a frontscroller* sooner or later to mark this , and I'll be building upon it incrementally. Don't worry, I've made the variables easy to understand (they explain themselves)!
Just a sneak peek of the features: (Examples will be shown later, and even though it's not at all good compared to other things out there, it's just a little homemade engine in alpha state.)

[+] Move using UP and DOWN, LEFT and RIGHT to strafe
[+] Can attach obstacles
[+] Amount of objects spawned adjustable
[+] Swaps depths according to size (May make SWF flicker)
[=] Moving out too much can result in absurd relations of distances

It's not much , but good for a start...I guess. If I ever got around to AS3, I'd scrap the current AS2 engine and start a real 3D FPS engine...sooner or later.

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* A frontscroller is similar to a 3d fps except you can't turn left or right, only strafe.