A wise man (Zildan) suggested me this solution when I was in a similar situation: take one of the existing partitions, e.g. the largest one, delete it and create a new extended partition in that space. Then in the extended partition you can create multiple logical partitions. Make one larger partition for movies, recording etc. and a few 250MB partitions for installing different E2 images - you can use them in a cycle as new images get released.