While I do agree with missinglinq, you shouldn't have such huge form that it requires scrolling, it is possible to enable scrolling by doing this:
1) Maximize the form. This solves the problem of two scrollbars, one for Access Windows and one for the form itself.
2) Use MouseOver event for all non-interactive controls & form's section to set focus back to a control contained on the form's header section. A good candidate is a textbox that's locked, enabled, has height & width of zero twips (e.g. practically invisible but without disable the .Visible property)
It should then work. Mostly. There are some gotchas, and I'm going to bet that it'd be next to useless if the forms had several interactive controls which would certainly conflict with the Setfocus behavior.
Believe me, it's easier to just use a tab control or subform to "page" the whole thing.