I don’t find that using arcane torrent and my trinket with Divine Plea to be “bad” or a waste of mana, because I’m constantly casting, even while Plea is active – so I’m burning through more mana while I’m pleaing. And at any point past the first plea, you are going to be down more than the 24% mana that plea will return to you anyhow.

However, there are times that I will torrent/trinket staggered with Plea. I just find it’s easier for me to remember to do it all at once and not think about it again for another 2 minutes

Or, no, I don’t have an aura for arcane torrent. However, I tend to torrent on cooldown with Divine Plea. And since both are on a two minute cooldown, it’s pretty easy to hit both. Alternatively, I bound my jar to arcane torrent – which is also on a 2 minute cooldown – so when my jar is ready, so is arcane torrent.