Routerboard simple que priority

Hello is it possible to change the priority of all simple queues to say 7 with one script?

Hi.
in 5.x version you have only one priority, in 6.x you have one for download and one for upload


for change priority to 7 for all queue simple in 5.x:
queue simple set priority=7 [find ]

This is very helpful, but is it possible to do all ques at once?