This is a minor workflow annoyance, at least for me, but since it should be a quick fix (hopefully), I'll make the request. Whenever you select a string field in Unity's inspector, it selects the whole content of the field, but if you click the field again it goes back to the standard single-character selection cursor. From then on, if you want to full-select all you have to do is double-click the field. This is the optimal behavior in my opinion, yet in Playmaker no matter how many times you click on a string field it'll *always* full-select it.
You can still drag-select, but it's truly annoying as it is and I don't see a point to have it working differently from the standard Unity behavior.