Ability to set non-management network as default route used to be custom property. Now it is part of the UI. See https://bugzilla.redhat.com/show_bug.cgi?id=1200963
When done, please obsolete https://access.redhat.com/solutions/2956471 and point it to the new documentation.
Accepting this and related bug 1502541 into Beta 2 program, and assigning to Byron for review.
It's great to do a proper code-review for doc changes. I've commented on https://gitlab.cee.redhat.com/rhci-documentation/docs-Red_Hat_Enterprise_Virtualization/merge_requests/805/diffs#1be30a901778d85f717c5f818b357217080bb984_0_13
This content has been published to: https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.2-beta/html-single/administration_guide/#Configuring_a_Default_Route