As much as I support looking at the documentation and learning more about Decker (:D) I don't think there's anything in there that would help with the tablet issue. Decker should be as easy to use when you plug in your tablet as other art programs are... but computers can be weird and sometimes we need to poke at them to make them work.
If you don't mind... I have two things I'm curious about:
Are you having the same tablet trouble in both Web Decker and in Native Decker?
If you don't know what I mean by that, Web Decker is the version that runs in your web browser (like this copy of the official tour or wigglypaint) and Native Decker is the standalone program that you download and run on your computer.
The other thing I'm wondering is whether or not there are some settings inside of Wacom's driver software (Wacom Center?) that could be adjusted. My tablet has a different driver software so I'm not sure.... but from what I know about Wacom it's possible to create program-specific settings (like shortcuts, etc) and maybe there's some way to modify how your tablet interacts with Decker in there? (Maybe?)