The file jquery-ui.css in the customized ZIP download contains a ThemeRoller link which is very useful. This link does not include the components selection, though, making it less useful. My hope as a user would be for this link to exactly preserve all the configurations that I made.
I find that this link correctly preserves all the styles which the ThemeRoller URL as displayed in the browser currently does not do.
The link looks like ...folderName=custom-theme&bgImgOpacityError=&bgImgOpacityHighlight=... which I think is preferable to the other format ...zThemeParams=5d00000....