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This requirement has been evaluated. This enhancement would encourage a behaviour that is not recommended:
"Although the same GID can be assigned to multiple RACF groups, it is not recommended. If you assign the same GID to multiple groups, control at an individual group level is lost because the GID is used in z/OS UNIX security checks. RACF groups that have the same GID assignment are treated as a single group during z/OS UNIX security checks.
You can enforce identity uniqueness when assigning UNIX identifiers. For more on controlling GID uniqueness, refer to Controlling the use of shared UNIX identities. A unique GID can be defined automatically using the AUTOGID operand, as described in Enabling automatic assignment of unique UNIX identities."
From: https://www.ibm.com/support/knowledgecenter/SSLTBW_2.4.0/com.ibm.zos.v2r4.icha700/ussgid.htm
As such it is not likely that this would be implemented in future zOS Connect EE releases, so correspondingly this requirement is being rejected. You have an opportunity to resubmit in twelve months time if you wish it to be considered then.