FlashDevelop includes some "magic" shortcuts which may not appear in the menus.

F1 - contextual Actionscript help: runs a smart websearch

F4 - goto class / member declaration - if you press F4 on a package, the Files panel will browse to the package's path

Shift+F4 - jump to previous location after having pressed F4 or selected a member/class in the Actionscript tree

Ctrl+Enter - Project / Quick MTASC / Test Movie hot-build*

Ctrl+Space - class / member completion list

Ctrl+Shift+Space - display method parameters

* Hot-build tips:
- when you fire the hot-build, FlashDevelop will try to build the current Project (if any), then try to do a Quick MTASC build, and eventually call the Test Movie In IDE command (can be disabled in the program settings).
- if you want to use a Project to manage your resources and the Quick MTASC build feature, you have to clear the Output SWF field in the Project options.