first of all sorry for bumping this topic.

However I've upgraded to Qt 4.3.2
(primarily to get https support)

and I've noticed that using a project like this:
Qt Code: 
  1. TEMPLATE = subdirs
  2. SUBDIRS = main plug1 plug2 plug3 addin1 addin2 servcfg
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qmake now create the makefile with both "release" and "debug" targets
(if the debug libs are compiled I think)

calling "qmake -r CONFIG+=release" sets "release" to default otherwise
when the debug libs has been compiled "debug" is the deafult and optained
again by calling "qmake -r"

thanks again wysota for your insigthful reply.