I keep all of my animals in the same room, some are even on the same shelf.

It's not an issue... I just make sure that I wash my hands really well after handling a rodent and before handling my snakes... soapy clean hands smell very different than rodents and I've never had a snake get confused.
I also make sure there's no line of sight between snakes and rodents so that they don't start hunting through the glass, or learn to hunt outside movement (like fingers).

My ball python has started feeding more aggressively (which is great cause he used to go on strikes for months) but he's still as gentle as ever to me and does occasionally still refuse a meal. My kingsnake (by far the most aggressive of my snakes before I started breeding my own feeders) can be found cruising for food at all hours, no change there, but hasn't got any more aggressive. I would say the snakes are more ready for the food now, and feed more readily in response but they don't hunt my fingers any more often.

I didn't originally want to keep then in the same room but I live in a one bedroom apartment so there no room to separate them. I can smell the rodent from the other room, I'm sure the snakes could.