Bsharp

I have found that you can "push" a bunch of notes together all at once, from either the front or the back, but I think it won't push the barlines as well, so it's best not to have those, or if you move a barline it'll push all the notes in that measure, but not other measures. If you want to make room for more notes, try the "Insert measure" option under Edit. That will give you lots of space for new notes. Then once you are done, use "Layout" under Edit to get things spaced out evenly. I hope that helps.

Try selecting the measures (they'll turn blue when selected) then use Ctrl C to copy then choose where you want the measures and then Ctrl V to paste. You should select an empty measure to paste or the stuff will get overwritten. If you described more what you're trying to do it would help.

I think the only way to do this is to adjust the staff height in the document settings until it looks right. Changing the paper size could also work.

I just discovered this myself. Once you make the rest, you right click and then it'll ask for the duration.