I'll probably leave the trigger alone. I've grown accustomed to the gun. It is a tack driving - woodchuck killing machine as is.
As for oil, I've tried many, Rem Oil, Tri-flow, and other gun oils that I've picked up. I'll be honest, I'm a slob when it comes to my guns. I shoot them, put them away, and expect the next time I pick them up for them to be as I left them. Probably why I own so many dipped guns (next to no finish maintenance). Most of the time my Sportster gets grabbed on a humid day to thump the woodchuck that I saw out back. I'm sweating, I grab it, let the gun do it's thing, then I go back to what I was doing; meaning the gun gets thrown back in the case "as is". Then it rusts. I hate grabbing an oily gun as well.
I thought about film dipping it. But I've been doing a lot of duracoating myself as of late. Duracoat seems to be an almost no-maintenance finish so far for me, so that is what I'm going to do with the Sportster. It will give it a different look that has the durability that I don't really have to think too much about.
Like I say ... I'm kind of a slob with my guns.