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1. Is there a reason why the subjunctive is excluded from the inflection output?

Yes, laziness.

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2. How far have you studied it? The African Voices material only covers the present subjunctive I think?

AFAIK there is only the present subjunctive. Would it make any sense to put it into other tenses? I'm going to add the subjunctive. There's still some room left next to the present tense.

You are lucky to be able to study with a private tutor! I'd be glad if I had someone to shout at when things don't seem to make any sense.

Ever tried? Ever failed? No matter!Try again. Fail again. Fail better. --Samuel Beckett.