Does Pulsonix support length matching within differential pair like on this picture?
It's something like serpentine function but within a diffpair (i.e. only one track is serpentined).
I assume it's possible if differential pairing is removed from a segment of the diffpair and then manually editing that segment but it would be nice to be able to do it without removing deferential pairing.
Differential pair skew is part of V9, at present in V8.5, if you wish to increase the length of one side of a differential pair, you would indeed need to 'Remove differential pair' and add the length to the one side.
In V9 you will be able to maintain a differential pair and add length to one side interactively.