Hi Madcat, yes, everything is fully customisable (picture, icon, all text on all buttons even, if you really want to change it); there are also currently six different styles of setup panel to choose from. Version 2.0 isn't out yet (it now detects video card[s] too instead of saying "Primary Display Driver" etc). Version 1.3a can be found here:
http://www.rumramruf.com/GSFinishingSuite.htmlHowever, I wouldn't recommend using it for anything other than the Pro version, as there is a bug that causes system crashes with other versions - it would be better to wait until v2.0 is released (all bugs have been fixed for 2.0 along with all the new features). I'll post in User Contributions when the new version (and new website) is up (as it uses A5 features only available in Beta at the moment it will be after the next A5 update).
@Ripa, sorry, didn't mean to hijack your post. I've checked out your file-packer and it's a nice program. I see there is already a setup panel so you probably won't want to use mine. In the spirit of healthy competition, if you download the old version of GS-Startup Manager from the link above, you will find a WDL script called "scrnres.wdl". This does what you want - you can then start up the game using commandlines such as "-d 640x480x16" etc. Just give me a small credit and maybe a link in the readme or somewhere if you use it.
Cheers,
Keith