I just had a little idea what could be nice to have in Renoise 
In Renoise you can arrange your song by putting together different patterns like
Pattern 00
Pattern 01
Pattern 02
Pattern 03
Pattern 04
Pattern 04
Pattern 04
…
As some of you know sometimes you have to create different version from the same song, for example a Short Cut and an extended mix.
A nice features could be that you could jumpt beetween different Arrangement and give them a name, so you can save your different mixes / arrangments in one Renoise-Song File.