Grayed out settings in ver. 7990 64Bit installer

[dado023]

Some options/setting are grayed out in 7990 64bit version of avidemux.
How can i enable this?
look here:

[Jan Gruuthuse]

Not enabled by developer, this is what advanced user nibbles tells aubout this:

Yeah the x264 configure dialog is only about half finished.  That codec changes so often that Mean could spend all his time fiddling with it, but eventually it'll happen.  Try to choose a couple of options that are essential to what you are doing and request that those be enabled.  We recently got Adaptive B-Frames working for example.  If you need everything x264 offers as soon as possible, you probably will want to use ffmpeg+x264.

2.6 is work in progress (experimental / beta)

[dado023]

y, i am aware of that, but 2.5version has older x264

[dado023]

is it possible to have x264 r2200 in avidemux 2.5?