It would be awesome to have separate settings for the coast distance on the perimeter and infill. I find that the perimeters need a relatively short coast distance and that solid infill layers need longer ones. I can make a perfectly smooth infill layer, but then I have gaps in the perimeter. Or I can make a perimeter that meets perfectly on the start/stop point but then I extrude a little too much on the infill and the nozzle will drag though it. It is nit-picky but would make the software more powerful and customizable for each machine's characteristics.