Hi have also KP3 and already try i with resolume but i don't think is usable for mixing... for effects parameters maybe if you assign 2 parameters for x and y
you may change the resolution in the configuration file. i don't know what is your system...does the led display have a small application that grab part of the screen ? if is you may whan't to grab some app to make "custom" resolutions to your second DVI i already did this here: http://www...
it can be platform independent.... i don't know what programming language they are using for R3
but there are several programming languages that are platform independent like Java for example