Add a modeless PowerPivot Measures Pane (or make the existing one modeless)
Why is the PivotTable Fields Pane non-modal, but the #PowerPivot Measures dialog modal?
I LIVE in that Measures dialog. I ALWAYS want to have it open. And I want to be able to park it permanently over in Monitor 1 where it can merrily not obscure my Dashboard like my Fields pane doesn't.
Kenneth Barber commented
Why not just instead use the Power Pivot window's measure grid to write your measures?