Hello, i’m also interested in an answer.
Actually i’m using this system and i need the category ID to be send within the form.
For example when i’m on a specific category the GET value of “cat” is 53
( ?cat=53 )
And when i press search on the form in this specific category, the search is done but “cat” value doesn’t exist anymore in the new page.
I don’t know if such a thing already exist in your plugin ?