Still think search should include all city markets in 1 list instead of having to visit each city market seperatly.

****Technically you can summon your retainer anywhere and give them items. But there may be an issue that when you send them back they do not go there (probably a bug that will be fixed). Should not re-design game around this bug -- better to fix the bug.***

Before you could not summon your retainer when shes standing somewhere and selling items at the moment.. summon could only be done when your retainer isn't actively selling stuff..or if you could summon , your retainer has to be reactivated to sell stuff again.. so unless that is changed , it's useless
May be wrong here and may have been changed , but that's what i remember how it was.