I've seen several comments from people (including reviews) about how frustrating it is that 'Word to Go' doesn't support 'page up' and 'page down' so you have to move around documents one line at a time. I was also cursing it for this omission.
However, I've just discovered that it does have this functionality, it just doesn't use the standard 9300/9500 controls for it.
Instead of using 'Chr+up/down arrow', it uses 'Ctrl+up/down arrow'. Also, it supports jumping straight to the start and end of docs by using 'Ctrl+e' to jump to the end and 'Ctrl+h' to jump to the start.
I stumbled across this nugget in the help file of all places (who'd have thunk it?).
Also, when you install 'Docs to Go', it installs a more comprehensive help file (in the form of a Word document) called 'Documents to Go - Start Here.doc'. You should find it in the 'My Files' folder on the communicator or memory card, depending where you installed 'Docs to Go'.