This was mentioned in passing in another feature request, but I just ran into the same thing and wanted to expand on it.
I'm creating an event registration for a marriage seminar. Along with the seminar, we're providing child care as a fundraiser. I created a single registration form, so people can register for the seminar and child care in the same form.
For the marriage seminar there is some custom information we're collecting:
Thanks for the post!
I've forwarded this directly to the developers as there's some great feedback for them to look at.
Hope this helps,