Hi,
I'm working with your Flowchartx product and I found
a couple of thing that I can't do because I can't draw on Flowchart Canvas...
So I suggest you these two things :
The first is that there are no way to change the behaviour of the selected objecs... that is: when I select a Box or an Arrow I can only see the small squares to indicate the current selection.
It would be nice if the selection can be also rapresented in different shapes...
the easiest shape can be a simple rectangle drawn around the box, another better shape can be a small polyline drawn around the box and following the box shape and the box caption, or around the arrow (drawn following the shape of the arrow, more or less like the shadow).
the color and the thickness of the line should be user defined (...and, why not, also the distance from the box).
A nice thing could be that line property(color, thickness and line type) can be defined as default at Flowchart level, and redefined at object level, so that in multiple selection I can even realize Group of selection

The very best should be that the user can define his own defined draw routine....but I suppose this is not so easy to implement...or not?
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The second enhancement is similar to the selection but done for gouping items together with a ...how we can call it ? "Bubble area....?"
that is: I suggest to add a property that can set visible or invisible the bubble, and a property at object level ( i.e. for box and arrows) to define the group to witch each item belongs to.
Another property should define the bubble area property, it should be a separate object, so multtiple area can be defined.
The bubble object should contain , Pen and Brush color, fill, type...
When visible, the bubbles are drawn around all boxes and arrows sharing the same "Bubble Group".
The bubble shape can be a circle or a square...
if the Bubble Radius is big enougth the boubble of the same group can merge togheter by forming a solid area containig all the objects of the same group.
The area fill can be drawn semi-transparent to let the original shape of each node to be always visible....
for example : suppe to have a diagram of people connected toghether with arrows... people can be male ( goup1) or female( group 2) ... when I set bubble group1 visible, the male boxes are sorrounded by a blu area,
when I set bubble group2 visible the female boxed are sorrounded by a pink area
wouldn't it be nice?
Franco