Once again, +1. This topic has been brought up numerous times, and each time I want to give my support. Allow switching during dialogue so characters with better skill can use them. Gale does Arcana, SH Religion, my Rogue with +7 Deception handles Deception, my cleric with +5 Persuasion handles Persuasion checks, etc.
It stinks when SH succeeds in Religion and then fails Arcana while Gale succeeds in Arcana and fails Religion and the party is just stuck because they don't hand things off.