I'm playing the 12 more and more, and so long as I am very careful with the tuning, the stuff I do with the partal capo, mainly playing teh D chord like a DADGAD D (except that with the capo in it's E) with one finger and using the other fingers to pick out a tune or countermelody rings out much better on the 12.

I'd like to use it on the rare occasions when I am talked into playing "Step it out Mary" (I mostly don't play Irish, since I'm not Irish) but I do it in Cminor with the capo at the 7th Fret and that is too much for the tuning of a 12 (the fat strings go sharp relative to the thin ones, even with a grooved capo, unless you have string-to-string saddle compensation which is a really fiddly job even for the best guitar techs)

I'm currently working on an arrangement for "Avram Bailey" in which half of the chords are up the neck (with the partial capo on) - the D (ie E) is a one-finger chord with an E note played on the G string at the 9th fret, the G (ie A) is a two-finger with an E on the A string at the 7th fret and another E on the B string at the 5th fret, and the A (ie B) is a bit trickier with the thumb over the top of the neck for the bottom B, index finger on the top E string for the top B, and the other B on the octave in between on the E string with the ring finger