There are two different widths of SB it seems that gets switched back and forth consistently.

There's wide:

[URL=http://s40.photobucket.com/user/Wolf_Spirit27/media/SB%20Wide_zpsykizrrle.png.html][IMG]http://i40.photobucket.com/albums/e247/Wolf_Spirit27/th_SB%20Wide_zpsykizrrle.png[/IMG][/URL]

and there's narrow:

[URL=http://s40.photobucket.com/user/Wolf_Spirit27/media/SB%20Narrow_zpshqobwxct.png.html][IMG]http://i40.photobucket.com/albums/e247/Wolf_Spirit27/th_SB%20Narrow_zpshqobwxct.png[/IMG][/URL]

I'd love for the SB to remain wide as it doesn't feel so scrunched and makes it easier to read a little. I'd especially like it if it didn't keep jumping between wide and narrow o.o

The reason one is wider is because it doesn't have a scrollbar. Changing the size of the SB would change the size of the entire sidebar, which you can easily do via CSS.

[edit] Wow nope tried this without my custom CSS and you would literally have to change a lot more than just the sidebar because Subeta layouts hate me.