I wouldn't be overly concerned about 4 1/2 lbs. if it's single action. Even double action, if you're accustomed to shooting Glocks. Just remember to keep the booger hook away from the bang switch, and you'll be fine.
On a separate note, was looking at some of the Taurus pistols that are on sale at a local gun shop. I was surprised to see manual safeties on their G2C and G3C models, plus they have trigger safeties too. I hadn't seen manual safeties for a while, except on 1911 derivatives, i.e., Kimber etc. Personally, I've moved away from manual safeties on my EDC pistols. One less thing to think about in the heat of the moment, though I know it can be overcome through training and muscle memory.