Checkout DragoWulf SpellUI Timer
window. This might be exactly what ya looking for. I use it for kind of the same as what you are saying except I use it to keep me updated when my DoTs are about to be or are expires so I don't overwrite them missing out on their termination damage.
I agree with ya about the Maintained Window. Just pointless to have to look at all those icons when ya only need to look at just very few, handul of them.
Also, the Maintained Window only displays
30 img icons when there are actually more so this is one obstacle you are just going to have to tolerate unfortunately.