Just started looking at the release candidate today, the custom fields are great!
I'm not sure how difficult or possible this would be to code, but I have a request/suggestion. When creating a custom dropdown field, the options will appear in the order they are entered. That works for a list with a few things, but one of the dropdowns I am creating will eventually have tens and maybe even hundreds of options. If there were an option to sort that dropdown alphabetically, that would be extremely helpful for my support staff.