My suggestion is simple yet powerful.

When at the summoning bell please make it so you can access all your retainers seamlessly. What I mean is when I right above quit should be the option "select another retainer". This will bring you to the retainer selection menu instead of making you quit then click the summoning bell every time you want to access your next retainer.


A second suggestion about retainers is I think when you summon your retainer it doesn't take all the stuff off the market board. When you put things up for sale they wont show up until your retainer goes away but things shouldn't be taken off until you remove it.