Possible Frameskip range 0.1-0.9?

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My question is,what 0.1 mean
1 is one frame(you could call it one image),so what 0.1 will mean...how will you skip less than one frame\image

Wouldn't be better(if possible)the frame skipping to work like this:
Skipping is set to 1 for example and and ppsspp display the frames like this...display a frame and stay on that frame until the next frame is ready to be displayed(I think that's how pcsx2 frame skipping feature worked way back and it was much more usable than now).

I think buffered rendering helps avoiding flickering but on some games it have another negative effect while frame skipping is enabled.

The way I understand it(I could be wrong),on some game ppsspp displays a black screen instead of the skipped frames...so don't change the displayed frame until the next is ready to be displayed(this may cause stuttering but I'm not sure...just suggesting)