Not sure that I am getting you right, but is the 'bird view' feature what you are asking for? I know it is not really visible, but it is the same as with other ORM tool designers. Let me quickly explain: there is a small icon in the lower-right end of the diagram, exactly where the horizontal and the vertical scroll-bars directions intersect - if you click there (and keep the mouse button in a pressed state), you will see a thumbnail of the diagram, and just by moving aroud it, you will make the actual diagram reposition? There might be usability issues with that, we want to hear all about it from you. And if you think we need more into that direction do not hesitate to give us more details about it.
All the best,
the Telerik team
Q1’11 SP1 of Telerik OpenAccess is available for download
; also available is the Q2'11 Roadmap
for Telerik OpenAccess ORM.