something that would be really nice would be "collapsible ajax-reloading custom fields". especially when you got a lot of custom fields, this would make less scrolling and you could change multiple fields at a time.
instead of ajax-reloading you could easily make an anchor on top of each added custom field, so the reloaded page doesn´t fall back on the anchor set at adding a new field. so much scrolling is really anoying.
thanks for your ear.