I've had pretty good luck keeping longnose from West TX on rodents, but to some extent it's a roll of the dice. Those that I have that took mice started right away without having to have scenting. Because of the relatively small heads, prey size needs to be fairly small. Mine do not seem to get fat on a mouse diet, but it does make sense to space feedings a little more than might be done for a kingsnake. In other respects, I keep longnose pretty much as I'd keep a kingsnake.
I wrote a profile of these snakes for the DFW Herp Society newsletter a while back. If you email me at -
michael@jsdragons.com - I should be able to send it to you as a pdf.