I think Trevor's approach is easiest but I sometimes use Staff Roll Mode too (as you mentioned).

To do this,

1) delete the second (repeated) note

1) activate Staff Roll Mode as shown on the image below

2) left-click on the centre of the note-head, hold the mouse button down and drag the horizontal blue line to the right for as long as you want the note to be held

Here's a Youtube clip to help. Even thought it shows an older version of BIAB, the process is identical today.

https://www.youtube.com/watch?v=uNyUl7yPHMw

Regards,
Noel

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