Ogrork the Mighty said:The key is whether the spell has a somatic component or not.
Shin Okada said:It is also not clear in the rule book. But many DMs consider removing a hand from the grip of a two-handed weapon is a free action. And many DMs also consider putting that hand back on the grip is also a free action. There are some DMs who has objection, though.
Shin Okada said:[...]There are several options for a cleric.[...]
Shin Okada said:4. Have more than 3 arms.
Like Thri-Kreen.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.