The ability to add a "+" or "-" to a field that allows a user to add or remove additional entries on a live form.

Submit the form without refreshing the page.

Setup fields to calculate values from other fields. This code would be saved as a default value for the form.
Example: [calc 232*234] (232 and 234 are field ids)

Change the email the form gets mailed to depending on the options in a drop down menu.

Would you like your uploads to go to a directory other than the WordPress "uploads"?

Also include an option to "Save this search"

Have a back button on all the pages (except the 1st) so people can go back and check what they have filled out

It would be great if we can get multiple image uploading, similar to uploadify. This would make it much cleaner than have several image fields. Also a thumbnail preview would be very useful

Form title
Form description
Field description
Collapsible section header
Width option on each select field
Form background color

E.g. Firstname: _____ Lastname: _____

instead of:

Firstname: _______
Lastname: _______

If you would like to save a value that is different from what the users see (in a radio, check box, or drop-down select field) you would need to specify two different values for that option. The user would see one value, but a different value would be saved.

I would like to see a friendly scripting language implemented into Formidable that would allow better data manipulation.

Similar to: http://www.zoho.com/creator/overview/deluge-script.html

Bulk edit entries by checking the box and select "Edit" form the drop-down that is currently used only for bulk delete.

if this is enabled for a form, the entries could have some statuses like unread/read/resolved/approved and contain a notes area

Capture data on the other page by sending all data to another URL

For non-profits, PayPal supports recurring donations through the "Subscriptions" feature. Non-profits use this same feature for more obvious "Subscriptions" such as membership dues.

I vote for FP to support PayPal Subscriptions in two ways:

1. Subscriptions preset within the PayPal client account
2. Custom subscriptions (i.e. recurring donations) where the term, frequency, and amount can all be set by the end users when completing the form

In addition to an autoresponder, it would be nice to send an email to all users who have submitted a form.
i.e. send an email reminder to all people who signed up for something days or weeks after they completed the form, using the email address they supplied when they completed the form

The ability to highlight multiple fields at once and copy and paste them within the same form.