Meredith,
In First Aid for the USMLE it describes special accomodations that can be made for students, and it includes learning disabilities. Of course you have to provide a great deal of documentation, but I gather from what you’ve said that that wouldn’t be a problem. It says some of the accomodations available include:
-Assistance with keyboard tasks
-Audio rendition
-Extended testing time
-Extra breaks
-Enlarged typeface.
Furthermore, according to 1st Aid, approximately 75% of the total number of requests for all Steps are approved. I do not know when the USMLE began making these accomodations, but apparently they are now available.
Regarding whether or not you should reveal much about your situation, I agree with Mary-- I think you should make some anonymous inquires. I know at my school we have interviewed students with physical disabilities. I don’t know how many have gotten in. Also at MSUCHM we have an extended program, where students can do the first year over two, or the second year over two years, or even in some special situations both. It is quite common for students to do this, and no one thinks twice about it (probably because the first two years are P/F, and students are not ranked. I would expect at schools where there is a grading curve that things would be different, as there might be a perception of an unfair advantage).
Anyway, good luck with whatever you decide.
Epidoc