Is it deliberate that you can no longer use shift- to add to a chord immediately after entering the first note? It doesn't work because the cursor has moved on.

That is, the following sequence:

click measure, N, C, shift-E, shift-G

when executed in 1.2 would create a C major chord on the first empty beat of the measure. But in 2.0 (build ff4a00f), all you get is the C. The shift-E and shift-G have no effect unless you first cursor back to the C. Worse, the first cursor back goes too far, so you actually have to cursor back and then forward again.