You can use the parameter -Bwin.menuGroup for this.
I added this line
args.Add("-Bwin.menuGroup=ThisGroup")
after the agr.AddAll in the B4jPackager code
but It still installs into the "Unknown" start menu group.
Is there another way to specify the start menu group?
I am surprised others have not had the same problem.
I must be missing something obvious to others.