@alexpacio2013 thanks for the nice compliment!
Yes, saving your own needed presets for having them available further on is the essential benefit from this tool and was my intention for making this tool (in a much easier version) about a year ago.
By the way, having easy access to standardized export settings is an underestimated point because it makes live so much easier in any downstream workflow such as layouting or so. And you don't have to care about your own sketchup setup anymore. You or even anyone else will be able now to reproduce your own absolute identical export results again and again any time you want.
Best, and I'm glad that everything is going well now.
Ps: don't forget to setup AND SAVE your remaining 7 possible presets
Hitting the Save button saves ALL your done settings, not only W x H.
When you close sketchup and reopen it any time later, your ViewportBuster will then open with YOUR own presets...