Well, sure, of course it would be useful to have a .deb file and get rid of the manual installation steps we have now! Especially for the less technical users by giving them an easy way to install - maybe even from extras!?

But, as I am no developer I have no idea how hard it would be to add IrMC later when mirakels finished his work...
Or why not even include the current state of mirakels IrMC? As far as I understand the only problem is that caller names are not shown, right? From my point of view a "half" working (but still usable) IrMC is better than nothing!?
Furthermore, it is not expected that .deb files in extras-devel are completely finished/polished, right?

Well, in short: You know better what makes more sense...waiting till everything is "perfect" or push it to extras and update it there...