Sellers credits for repairs

[Dale Couture]

My wife and I are looking into buying the townhome we currently rent. One advantage to us already living in the place we may buy as that we are pretty familiar with all of the problems it has. Unless our inspection says otherwise, we are pretty confident we don't have any major problems. But my main question is this: how minor of a problem is too minor to ask for seller credits for repairs when going through escrow? 

For example: we have one spot on the kitchen floor near the back sliding door that flexes when you step on it. It probably needs to be reinforced underneath. We have several places where the baseboards or other interior trim pieces have separated slightly from the walls and need to be caulked again and maybe even tightened up. We have a water stain on the ceiling from when an upstairs toilet was clogged and it was running and eventually flooded through the floor. 

Most of these things are mostly cosmetic and relatively minor I would say compared to say plumbing or roofing failures. Is it reasonable to ask for credits to repair things like this in the buying process?