I think that all dints should remain untouched as they all have a story to tell,I also belive that all old planes should look old.A few years ago a vintage motorcycle came up for sale.It was a M20 ex M.O.D.brand new unassembeled in a forgotton crate.Surprise,price was very low as it had no history.I am not saying for one moment that you should add dints with a hammer,but by fillers etc.you are attempting to erase a little bit of history!