Version:           1.3 (using KDE KDE 3.3.0)
Installed from:    Unspecified Linux

It would be really useful if it was possible to choose the dimensions of the image when exporting to
PNG.
Often the images generated are small and must therefore be scaled up when used (in documentation etc).
This looks really ugly.

Suggestion:
Aspect ratio should always be preserved. Add two text fields which show width and height containing the default values based on the current diagram. When one of the fields is changed, the other is updated too, so the user can see if both width and height are acceptable, before pressing OK.