We’re always in a listening mood 
I would highly recommend keeping the product the same as much as possible between the cloud and on-prem.
So i hope it’s clear that in this case this is not a saas only feature. The url method is what we’re intending most users to use and that’ll be out in an early 22.2 update. The ice.sysconfig based option can be applied on prem as well and is supported in that environment though it’s true that we didn’t provide UI for this configuration flag in the first pass.
Update: I neglected to actually share the key it is
ICE.Sysconfig:
- Key1: ‘AdvertiseAuthentication’
- Key2: ‘Basic’ //or SSO or AAD or…
- SysCharacter01: true/false
Again though we think the url method is the better option for most cases and that’ll be out soon.