I think FC is a great idea and have been playing around with it, when comparing different tools for doing interactive wireframing UI mockups.
The beauty in having FC is being able to have the UI wireframe design actually be directly reused into the real product, and being skinned and styled and mixed with the live code.
Some feedback and suggestions:
1) Post-it style comments
It would be excellent to be able to add post it notes with comments in each page/state (like one can easily do in Apples Keynote).
This would be great to have when sharing a UI workflow design with other team members and wanting to add comments or notes to the current
design. What I´m doing now is adding the text tool (which is painful at it´s current state, as many others have commented) and changing font color + size to differentiate it.
2) More Wireframe components
I´d like to see more default components added, like Tab pages, tree view, image placeholder, dialog, stepper, ballon help, warning message box, radio button group, text editor (rich and normal).
I think having many of these in place (and maybe with a bunch of skins to pick between) would help many developers wanting to build RIA´s using Flex/Flash.
Check http://www.foreui.com/demos/demo0/ to get some inspiration!
3) Smart Alignment/snapping
Here too you could look at CAD programs as well as other Adobe products, so that when moving graphics around the layout it would mark
with lines when the object(s) you are moving align to other components, to left/right margins (and with a offset from the margins too), centers, etc.
See the foreui.com demo again for inspiration, or CAD programs like Catia which finds all sort of geometric and distance/angular relationships that might be of interest for the user.
4) Hierarchical pages
If you add Tab pages, then it would make sense (and probably also anyway!) to have some sort of hierarchical/tree structure for the states.
So if you have a tab layout with 3 tabs and want different states within each tab they should be grouped under on state.
So that they also can be grouped for easier navigation.
5) Data list, columns?
The data list can only have rows added. How about making it two dimensional, so that it´s a table?
To edit the table data I noticed the foreui behaved just as I expected. It gave me a comma separated list, and if I added one more comma I got a new column. This works both for the top headlines row and the data below, example:
Name Email Phone
John email@example.com +46123456789
Eve firstname.lastname@example.org +134234324324
would be presented in the edit field as:
Name, Email, Phone
John, email@example.com, +446123456789
Eva, firstname.lastname@example.org, +134234324324
And if I add one more element it would automatically expand it that direction.
6) Maybe have some sort of way to visualize transition mappings?
I´ll start with this feedback and get back with more, it´s getting late here (03:10 am).
Looking forward to hear your thoughts on this feedback.