Exactly, @kinggo. Plus, who is to decide which options you "setup once"?
Three examples from Sailfish of settings I use all the time:

1. Picture size in Camera. I change that based on what the picture is for.
2. Delivery reports in Messages. My provider charges me 2p per SMS where all others charge 10 or 12p, but at the price of charging extra for delivery reports. So I enable them only when needed.
3. Clear browser history. Need I say more?

In all these cases, a direct access to those settings straight from the relevant application would make much more sense.