Exporting to GIF (and maybe also other export format) does not ignore images with the "export" checkbox unchecked.
Although I could just turn those images off before the export to work around, I still need to turn those back on as I need those reference images and backgrounds when making the animations. It would be better to have the 'export' checkbox works on all kind of export.
I also have a little suggestion on export viewport clipping. After realizing 'export' check box is ignored on gif export, I tried to use 'crop' to limit the export to show only what I want. It require me to enter the values for the visible area which is very hard to use! It is not easy to get those coordinate without using a bone. I suggest to provide an option to simply take the value from preview canvas for clipping. That means the export will be exactly what I see from the preview panel when that suggested option is used.
Another minor issue:
The split bone dialog is only remembering the setting of number of splits but not the "Nested" state. Not to mention most of the time when splitting a bone, we want them to be nested so the default value is better to be nested.
