I love FlashDevelop! Just had an idea that could make it even better: the ability to add "milestones" to your project.
Usually before I start experimenting with something, I make a backup of all my files so if something goes wrong or i change my mind, i can easily revert/undo everything.
Tried to look for a plugin, but couldn't find any, probably it doesn't exist.

Is it just me or this would be really handy?
Ideas?

Why not just use version control?

Git branches are pretty much designed for this use case.

I do use version control, but we usually work in a group and it's never a good idea to update the repository with changes that are not ready to use.
Hence i thought it could be handy to have this feature inside FlashDevelop

If this workflow becomes a problem, consider using distributed version control with local branches.
Just like ricick recommended, you could use Git.

This is not an IDE-type functionality.

I'm not really familiar with local branches, so i'm going to check them out.
Probably it's the solution i'm looking for
Thanks for the recommendation!

http://nvie.com/posts/a-successful-git-branching-model/

This link describes an awesome development model for using branches with Git.