In these markets that is plenty of leverage. But there is a reasonableness factor at play here. Ask for things that effect the safety and value of the home and not cosmetic or small items. You will have greater success. If you are represented by an agent ask them for some guidance on these issues.
I am certain that if both sides want to do a sale you can get this done in good faith.
Dirk T Knudsen
"The Real Estate Doctor"
We write up any Items we want the seller to complete on or before the deadline and the seller responds on what they are willing to do. Usually you have some leverage on these items.