> I think it should be part of this change, otherwise it appears a bit half-baked and make users wonder why certain things work and others don't. I guess both cases (first conversion, then method, and the other way around) should be supported. WDYT?

I'm inclined to say you're right. However, I also would like to finish #119 (and make sure this was actually the last issue :) ), getting it into the upcoming Beta Release. This has some prio for me, because getting this right actually makes it more easy to convince my surrounding to get Mapstruct as a tool in my daily business.  Adding UT is going to cost me some time and I reckon that #119 also still is time consuming (knowing its past).