mitigation
No, wound dressings are generally not recommended anymore. Depending on the condition of the wound, degree of tearing, exposed stub (if any), and the condition of the trunk area or bark ridge there are not too many things you can do. If there is any chance you can throw a picture up it would help a lot for suggestions. Basically you want to leave a clean cut and leave the branch collar in tact so wound closure can occur.
As for the question on construction damage, if you have an example please describe it, if you don't have an example, don't make one, keep a distance of 2-3 times the drip line marked off as a protection area for the trees that are to be retained.