Hi,
There isn't an option coded for the wrfrst files, but there is for the wrfout (history) files. If you're capable, you can try to add some code to include the same for the wrfrst* files. You'll need to modify a few different files, such as
inc/namelist_defaults.inc
inc/namelist_defines2.inc
inc/namelist_defines.inc
inc/namelist_statements.inc
inc/nl_config.inc
inc/config_assigns.inc
inc/state_struct.inc
Registry/registry.io_boilerplate
share/mediation_integrate.F
There could be a few more. Just check for "history_outname," which is the namelist option for outputting history files elsewhere, and use the coding for that parameter as a template for doing it for restart files. Let us know if you're successful!