It would be nice to have pattent/part bank to use to compose track elements. All putted clips to arrangement should be shared copies of sources from bank - similar to scratch pad but with option to share copy. Pasted parts/pattern should not be removed from this bank after placing in arrangement.
Actually scratch pad could be this sort of bank but there is no option to share copy of part when pasting to arrangement (only patterns and sections works this way).
Creating track with many repeated parts would be much more pleasant and there would not be necessity to rearrange all track with one charge in some part..