I use some techniques on concertina which include turning quavers in to semi quavers, so if one had for example two dotted crotchets in jig time, i might play it ornamented same notes instead of one long note, i might play two quick semis and two quavers, ditty dum dum, or dum ditty dum or even dum dum ditty, I am assuming this would be done with the tongue as one might also do with a recorder or whistle,.
Steve Shaw is an expert harmonica player I would appreciate his opinion, I know that this is something Brendan Power briefly mentions in his tutor book