As now you cant, there is only global options, not per rig, sorry.
Not chances even with script or on driver level?
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you can only set global options not to reboot if ne gpu will crash:
Rest of gpus should be mining
-wd 0 -r 0 -epool stratum+tcp://............. -ewal 0x................... -eworker $rigName -esm 0 -epsw x -allpools 1 -mport -3333