Hi,
As it is major change in Album art handling it is pushed for MM 5.1. where we will consider needed features to work on Album art images.

It has been a long time since this post. Is there a chance this has been added or we might see it in a future release? It would be immensely helpful.

At the moment the best MM can do is to remove any artwork as it is being synced if it is larger than a certain size (see device config options).

I have a Sony A818 and was wondering if there was a possible way of MM automatically resizing the album art to say, 250x250 or 200x200 when syncing, sort of like WMP?