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I think it would be nice for the VAR Package builder include a Custom option where you can enter your own license that isn't included in the drop down.
I think the idea is to enforce licenses a bit to make sure they are compatible. CC is a good choice for that.
Edit: You might have noticed that since the introduction of VAR far more creators use other peoples stuff and share. That did not happen before, among other things because the licences where unclear.
Is there a specific license you want? I could add custom, but as @MacGruber mentioned that means it might make it harder for people to reference your stuff. Maybe in your case that is ok.