michael, thanks for this.
i have been running a big thread on score issues for sometime here:
http://discussions.apple.com/thread.jspa?threadID=151978&start=0&tstart=0
and in particular my document regarding some of these bugs here:
http://www.stevenson.homechoice.co.uk/documents/LogicProScoreRequests.pdf
i have to say, i am so desperate to have these score issues looked at i would just about be prepared to donate a kidney, or any other appropriate body part.
i use logic as my notator of choice, despite its flaws because it is so fast and flexible to create scores with. i can and do write sohpisticated concert music with it. you can manipulate data in ways you can't with more traditional notators such as sibelius and finale. i have used both and it feels like putting on a straight jacket after using logic. but they are catching up, and sibelius in particular is solid, and simply a more complete package for notation.
i would do whatever it took to get logic's score editor and step time (i almost only ever step time) looked at and sorted out. at the very least, get what features it does purport to have to function correctly.