Add and subtract from selection with finger modifiers

[andrewsimper]

Feature Request: allow one finger modifier + draw rectangular selection to add to the current selection, two finger modifier + draw rectangular selection to remove from the selection.

Congrats on the release of Designer for iPad, it is already an awesome tool and I can't wait to see how it improves over time.

One area I think would be nice to have consistency between tools is adding and removing from the current selection with things like object selection with the move tool, and control point selection with the node and rounded corner tools. Currently a single finger hold and then clicking on the new object will add to the selection, which is great, but I can't get a marquee rectangle to add more than one object at a time like this. It would also be great to be able to deselect multiple objects at once with a marquee. One finger for add, and two fingers for remove would be awesome  

Also adding support for free form marquee selection would be brilliant.

The two finger tap for undo is becoming the standard and I use it in Concepts all the time and automatically did it in Designer and it worked too, awesome!