Graham
kapilover08 filelist can only list 1 folder at a time so using the filelist filter you would just have to run the same search for each folder and then just output the results in one block but the paging (if any) would be messed up and the order may be jumpy if there are multiple returns.
In theory you could use the filelist template to populate a javascript array from the results of the filtered filelists then sort the array and add pagination with javascript