I sort of think this is a poor patch to the current clunkyness of the retainer interface. All limits of it we currently have seem to be based on fundamental design where only one retainer's functions can be accessed at one time. Whatever hardwired addition the search function is, I'm not sure how beneficial it would be to add more hardwired quick solutions.

Don't get me wrong, I'd really like to see the retainer inventory system improved. But I'd rather see it build on new base, where accessing each retainer and thus their inventory is just tab away and thus also switching items between them would be simple enough (drag the item to other retainer tab, for one possible way). Adding a clunky solution to clunky base would just perpetuate the problem.