We use legacy premill for the shelf edges, so the parts are cut to the correct size from the CNC. Problem is the fixed shelves have the dado set too long and it leaves a gap between our edging and the shelf, weve been piecing bits back in as i forgot to fix it, so i'm looking for a universal fix. I cant see any global options that wont effect other things. My initial thoughts are to edit the fixed shelf sub assembly in library designer to ignore the dado settings and essentially have no lead out on the tool. Think there is a better option? I dont want to loose the dado as its nice and easier than dealing with someone not putting in a shelf level by hand. 

Example 1 fixed, example 2 screenshot is original, you can see the dado is longer than the shelf, this is my issue overall.