I forgot: instead of using hue and saturation, you can use the channel mixer.
To enhance the colours in an image, you can up the slider for the channel and bring the others half of that value down. Then you can tweak with composite.

example: choose the Red channel (top dropdown list). Set the Red slider to, say, 116. Then you have to bring the other two down with 16 in total, if not you change the brightness, or -8 for Green and -8 for Blue. (you can of course play here as you fancy as long as the global plus and minus balance each other. ie: Green -6 and Blue -10)
Do the same for Green: up the Green slider with a value and see that you down the others so that the sum equals that amount. This does not have to be the same as Red!.
Then the same for Blue.

When you give all three the same value up, and the other two for that channel down, for example:

R +16 -8 -8
G -8 +16 -8
B -8 -8 +16

you have a pure saturation result.

When the differ and you start playing with composite (at the bottom) you can change the hue.

Some will say that the advantage is that you have more control, others that you have more space to play in.

This method is meant for subtle changes. Theoretically you can desaturate or oversaturate a lot, but that's not the intention.

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