I'm afraid we can't configure such parameters, at least I can not find any documentation or configuration (also not on the newer AirOS 8.0 code). Maybe you can work with a CPU ACL on the WLC to limit traffic to the control-plan (if central firewalling is not an option)? You can also disable SSH, but that does not fix the underlaying problem...
If you really want it to be fixed, I advise you to open a TAC case. If they see it as a feature enhancement you will need to contact your Cisco account team.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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