Here are a few things I think that should be changed:
1) Lightning Flash: Change it to 1200 or allow a trait to upgrade the range.
Staff Elementalist need it especially since they lack mobility, and it wouldnt
make it OP since the Mesmer has one longer than 900 range.
2) Make Conjure Fiery Greatsword like the other conjurers in where you can
cast it while running. The greatsword is the only conjurer spell that
requires you to stand still and channel it!
I have a much larger list in my head, but the above two I think are just over
sights on the developers part.