These functions have not used by anyone in the past (except for patcher, BAMsE used this 2 times).
Splitter not needed while UltraARC do this.
I don't know what converter is already.
Lister is not useful for conversion design. In fact it's a simple batch that list all files in custom directory.
About MusicList:
I was not able to downsize the list in height. MusicList is always as height how much titles are in Music folder.
What about the idea to rework the music list like language bar (with arrows)?
Also there is a problem with CPU usage and system lags under Win10x64 for some of CIU components (i guess something with bitmap draw). In fact it's WDM.exe (Windows Desktop Manager) that got a crazy CPU usage and cause system lags if you use bitmaps like this
http://imgur.com/tUyFfZq
Maybe you can investigate it further. Maybe it's caused by some Windows features too. I don't know.
I have tested on my desktop PC and a test PC with a new windows installation, also my Notebook.