There is no specific way to identify TYPE=USER that don't have a MODE.
You can issue to know who has got (e.g.) FAIL MODE a TSS WHOH MODE(FAIL).
It will list all acid having FAIL MODE, but without distinguishing among TYPE=USER or TYPE=PROFILE.
And this is who has and not who hasn't.
Also an acid without any mode permitted, will inherit the FACILITY MODE it will run under.