Roncolord |
He can't use Spellcombat and use the weapon two handed.
Pathfidner has the concept of "hands of effort". Spellcombat requires one hand of effort, and wielding a one handed weapon also requires one hand. Wielding a two handed weapon requires two hands of effort. Since Spellcombat is a full round action that takes up one hand for the full round, he can't use his weapon two-handed on that round. However, rounds in which he doesn't use spell combat to cast he can use his weapon two handed.
So, as a for instance he could move, cast a spell as a standard action, then use Spellstrike (which is what lets him deliver spells through his weapon) with his longsword and attack two handed (by taking a couple free actions to shift his grip around to cast and then move to two-handed).
The short answer is no, no two-handing during Spellcombat.
Thanks to you and everyone else for answering.
I'm on your same line of thoughts, but I need a rule reference. Jisher may be right on this, but still I would like a rule that specific it