Filter/userspec by tab

[nsp]

I always use many tabs in all side.
I do some filtering using cd *.dat , cd *.log *.txt | _*.* ... and then apply ^B

This is not only applied to the current tab but for all tabs of the same side which is not what i want !

I suggest to have a filtering only applied to the current tab only like normal cd works.
The goal is to havie for each tab both current path and current userspec.

--edited
We currently have in wincmd.ini section letf/right that keep userspec filter, i suggest to add in lefttabs/righttabs section for each tab a new entry ?_userspec like ?_path and ?_options.
This could be done using a new command or a parameter for CD and/or a global setting to switch default behavior of CD.