[GNC] How to customize the default invoice (on print invoice button)

[Shanti]

Hello,

I'm trying to configure GNUCash so I can have nice invoices with it, and 
I used the "taxinvoice" report and I could configure it to my needs. 
Then, in the GNUCash preferences, business tab, I set the taxinvoice to 
be the default invoice report for prints.

What I don't understand is how to apply default settings to the 
taxinvoice report generated when I click on the print button. Now, I get 
an unconfigured report. is there a way to specify which report 
configuration to use by default ?

If it's not currently possible, can it be added in the code, where 
should I look to add this feature?

I could trace it to :

- function gnc_invoice_window_print_invoice : 
https://github.com/Gnucash/gnucash/blob/970e9af3423eb50b9823d264cf6685ccad0b2973/gnucash/gnome/dialog-invoice.c#L805
- function 
gnc:invoice-report-createhttps://github.com/Gnucash/gnucash/blob/a85520de7b222ac61fca2bf264143996bddc311b/gnucash/report/reports/reports.scm#L69
- function gnc:make-report-options 
https://github.com/Gnucash/gnucash/blob/a85520de7b222ac61fca2bf264143996bddc311b/gnucash/report/report-core.scm#L417
- function gnc:report-template-new-options 
https://github.com/Gnucash/gnucash/blob/a85520de7b222ac61fca2bf264143996bddc311b/gnucash/report/report-core.scm#L289

In the code it seems to create the options from scratch, possibly 
populating it from a stylesheet. But I don't see a stylesheet type with 
the same options as a taxinvoice. Is this a feature missing in 
taxinvoice? Are stylesheets supposed to be the way to populate options 
for newly created reports? Why not use saved reports?

Thank you for the information you can provide.

PS: please Cc me back as I'm not subscribed to the list, thank you

Shanti