I did create the 3rd jobs that we already have now. You mean create more alternative jobs for the classes? If you do, sorry but not a chance of that happening anytime soon - I just got a headache even thinking about doing that again.
I don't think it really makes sense to add more jobs to the existing classes - they went as far as they can really - there is only so much you can do with the skills and they end up converging with each other when you keep adding new stuff and people start moaning. That class shouldn't be able to heal it's not a healer, that class shouldn't have magic damage it's not a caster etc. ok I'll just add 10 more skills exactly the same as you already have then ok :P
I would like to create a completely brand new class though - Vampire, Bard, Archer, or some kind of hybrid caster/healer.