Info on creating groups and groups associations

[Ices-Eyes]

Hi all,
searching for some helpfoul macros, I noticed that in this collection there are macros to create stp, folders, libraries, ... but there are no macros to create groups or users, or ACT, and macros to associate groups to groups (while there is user to groups) or populate ACTs. Is there any reasons for that, or it's just because noone write those macros? I'm wondering if such a code could make any damage to metadata or something like it...
I.E. I would use something like this to create groups:

data USERS_TO_ADD;
    length _RC 8 GROUP_NAME $100 GROUP_URI $100;
    GROUP_NAME='TEST2';
    _RC=metadata_newobj('IdentityGroup', GROUP_URI, GROUP_NAME);
    _RC=metadata_setattr(GROUP_URI, "UsageVersion", "1000000");
    _RC=metadata_setattr(GROUP_URI, "PublicType", "UserGroup");
run;