"Default folder" missing dock icon

Default Folder is a great "must have" utility IMHO, but for some reason I'm not able to enable its dock icon.
Scrolling down to the middle of this page there's instructions on how to enable the dock icon, but I can't even find that option!
Could it be because I'm running it in OSX 10.6.8? I'm using Default Folder X version 4.6.8.

You mean they've been silently removing/putting back in that feature?
If the producers are feeling ambivalent about the dock icon, is there another way (i.e. hack etc.) to get it back?

I find it cumbersome to have to access the menu-bar every time I want quick access to a specific folder (currently I've put my user folder in the dock with the "list" view option, which helps):

I got in touch with St. Clair software who told me that the dock option has been removed because it causes issues with OSX 10.7 and up when in full-screen mode or when running any app in full-screen mode, however..... the option is still there, but unoffical and hidden:

1) Go to the Default Folder X preferences
2) hold down OPTION (ALT) while pressing the "settings" button.
3) enable "ShowIconInDock"

I can't remember but I believe I had to log out/in again in order to make it work.