‘pauca’ is neuter acc. plural, right…? I would say a few [things} about this [re].
Yes, pauca is neut. acc. pl.; loquar is future - "I will say just a few words . . . "
Iuppiter ad Aeneae: No, this is what Aeneas says to Dido. “Stop inflaming both you and me with your complaints [abl.].” incendere is infinitive complement of desine (imperative).
non mea sponte - “not of my own will”, i.e., I’m not heading for Italy because I want to myself."
Here’s what Vergil wrote (Aen. 4.360-1):
desine meque tuis incendere teque querelis;
Italiam non sponte sequor.’