"Save Selection as JPEG Images..." feature in avidemux 2.6 ?

[circcc]

"Save Selection as JPEG Images..." feature is useful when I make animated gif file.
but, where it is gone in avidemux 2.6 ?
I know 2.6 is not frame-based but time-based.
In time-based program, that feature is difficult to implemented?
If not so, please support it again. it is useful feature.
Thanks.