sortm arguments

Hi,

How do I change the arguments to sortm (mh-sort-folder) on a temporary basis? In the manual it says:

"The option mh-sortm-args holds extra arguments to pass on to the command sortm^3 when a prefix argument is
used with F S."

but how do I give F S a prefix argument? 

Until now I've used the mh_profile to change the sortm arguments but I'm thinking there must be a better way
to temporarily sort a folder by -textfield from or -textfield subject.

Thanks for any hints,

/henrik

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