I haven't looked completely into this; perhaps there's a possible override or workaround in the module files, but I'm feeling a really big need to have a variable width Flash Image Rotator.
In many of the sites I build, accessability is a must, so variable-width skins are a must. When it comes to adding a digRotate Flash Image Rotator, however, this sometimes doesn't work so pretty being it's a fixed width.
I added a feature request for this here, so if you like the idea, please vote on it!