Correct me if I'm wrong, but I don't think you need to release your acceptances by April 30th. On April 30th the "commit to enroll" option becomes available on AMCAS but by no means are you obligated to commit by April 30th. I know that OHSU will get back to everyone with a decision- whether it be accept, reject, or wait list by April 30th. I believe the Commit to enroll deadline for OHSU is July 20th (21 days prior to orientation). So you don't have to release your other acceptances until July 20th. I looked this all up, but if I am completely wrong can someone please comment?
Side note, on April 30th the curtain will be pulled back and medical schools will have the ability see where applicants have been accepted and where they have "planned to enroll". Allegedly, if you have planned to enroll somewhere else that should not deter medical schools from offering you a position at their institution.
I am by no means an expert so someone please correct me if I am completely off. Otherwise, good luck everyone!