Feature Request : Return to full configurability of x264 codec options.

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Up to at least version 2.5.6, the x264 codec was much more configurable:

- the three *qcomp* (curve compression) values ��are now fixed and cannot be modified
- *zones* can no longer be set

(ver. 2.5.6)
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Now (ver. 2.8.x)

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Why were they disabled? 

It would be great if at least these two options were made functional and user-adjustable again, as they were in older versions.

Xvid is also much less configurable than before: at the very least, AQ and PB-ratio should be adjustable, as these are important parameters.

Thanks.