To use sender name, simply enter My business name <contact@mybusiness.com> instead of contact@mybusiness.com
PDFs are not generated locally (yet). It is a bit challenging. Gecko (Firefox layout engine) is used to generate PDF documents but Gecko is around 30 MB. Manager is 2 MB. So I don’t really want to increase the size of the program 15x just to support local PDF generation.
I’m looking at alternative cross-platform libraries that are smaller in size and could replace Gecko but I haven’t found anything that would tick all the boxes. At least one library came close though.
Regarding vector images, I think it would be possible to add SVG support. For now, simply upload bitmap in higher resolution. Manager will resize it to make it smaller but the original bitmap will be included in PDFs so if printed, they will look just as good as vector images would look like.