what i've read (as i haven't played the K 466 yet) is that it was the most loved pc by the romantics. 'the autograph manuscript was for some years in the possession of johannes brahms, who not only performed it but also wrote cadenzas for it. beethoven, whose cadenzas are most often used today, did as well.' exerpts from 'a history of the concerto' by dennis roeder.
i was facinated by all the cadenzas written by mozart (excuse the diversion) and decided to make my research paper on the cadenzas of mozart and those that seemed to most fit his type of compositon. beethoven's are obviously quite wild in how far they migrate vs. some of the others. murray perahia, ashkenasy and others have written really nice ones. i think ashkenasy's was partly badura-skoda's if i remember right? i have to look at my notes.
anyway - as i see it - if one is to play mozart lightly and as 'like oil' - it would mean not overdoing anything. cadenzas, pedalling, etc. i think that is taste. when you get too much romanticism in classicism - to me it ruins it. like too much spice in a recipie.
the 'romanza' is a five-part rondo (ABACA) with a surprising c-section (hmm) hospitalziation required?, in g minor, returning to the agitated mood that dominated the first movement. mozart employs the very common thematic structure of aababa in the refrain A, which offers the opportunity of an interesting distribution of the theme's parts between soloist and orchestra.
a (piano) a(orchestra) b(piano) a(piano) b(orchestra) a(orchestra).