Maximo 7.6.1.1:
Is it possible to put a custom hyperlink or button in the start centre?
Ideally, the hyperlink or button would be in a custom container/box.
It looks like the answer is yes.
Export LIBRARY.xml, modify it by adding a full URL, then re-import it: Creating a hyperlink on the start center
Additional information here: Add URL to Maximo Start Center