at least with a twin even an old busted arse one going down on one engine is a lot slower than a SE therefore giving you more options/time. You can always close the remaining pwr lever on a twin if it's starting to get beyond you but in a SE yr cactus right from the start when it goes quiet!
Absolutely. Plus if the twin isn't at max gross, you might even climb.
As someone pointed out before, they would fly at the higher end of the speed scale for the APP
The problem with that is, that if the wx is really poo, the very last thing you want at DA/MDA is excess speed...