Oh... this is a big help for me and it works perfectly (Gimp 2.6). I finally found a script that will re-number the Frames sequentially which is needed to prevent confusion after deleting several Frames when dealing with 100 frames.

Number Layers Script
by ~Insanity-Prevails
Number Layers adds number notation to layers, starting at the specified layer number.

http://insanity-prevails.deviantart.com ... t-72632604