This does not at all look like a bug to me. Even while you type in a text in this forum, you will notice that this editor does not feature any scrollbars until the number of lines in the text exceed the number of displayed lines in the text window.
As for the other problem: in this thread
A Simpler Way to clone a complex mp3tag setup
you got a proposal but you have not yet answered it.
Also: it should be possible to create portable installations on thumb drives or something similar and distribute the unified installations like that.