It was an old accepted method of making bait, rolling them as normal, then placing them in a paper bag and air drying them in the airing cupboard until they go hard. I tried it, but to be honest, I didn't see much difference between them and boiled baits. I used to put them on cocktail sticks before putting them in the airing cupboard so when they were ready, i would pull the cocktail stick out and be left with a hole through the middle for the hair. I found that all I was doing was dehydrating the baits, so once in the lake, they re-adsorbed the lake water and softened up - there's a thought, a bait with the appearance of a washed out boilie!
other ways I tried was to increase the egg albumin levels and boil for 30secs just to skin them, (experimentation is necessary dependant on base mix) so the middle of the bait was still a paste.
or put the baits in a steamer to skin them, this can produce the skinned paste effect that may suit your needs.