I, for one, would like to see a 'Custom Install' that would let you choose which features/modules you want installed. The current 'Custom Install' only lets me choose where to install and whether to associate file types to MJ.
I use MJ for the Media Library's organizing, the tagging (I haven't seen another tagger that will mass tag files from more than one folder at a time), and the playback's integration with the Media Library. I don't use it for ripping, encoding, burning, light shows, wav editing, wearing skins, handling image files, or pouring a beer (lite or otherwise). I use it as just one of my audio tools, not the only one. I have others that specialize in what they do, and they do it extremely well, and I've become familiar and comfortable in using them.
I would be greatly pleased to have a version, or custom install of MJ that just organized, tagged (with support for more fields), and played my audio files (possibly with enhancements to these features). Everything else is just bloat as far as I'm concerned.
I realize that others have different preferences and that's why I think a customizable install would be great. (Although I can foresee providing support and troubleshooting for 3.2 million configurations would be a nightmare.)