I'm also considering a non-standard build. Summoning is a great ability, but I've grown to love Darkness so much that I might have to choose between some other skills, but I'll definitely take Darkness) because Subjugation and Berserk are awesome!))
Added after 4 hours and 43 minutes
Anyway, I took Darkness, Logistics, and Leadership:) I maxed out Light Magic to Expert and Strong Dark Magic:) and Advanced Logistics)
I have Counterstrike, Light, and Attack as starting skills, and I took Machines, Logistics, and Sorcery. Let's see how it goes) I'm starting the 4th mission now.