Calendar needs to be configurable to have weeks starting on Sunday.
In the U.S., the vast majority of guests are used to a Sunday-Saturday calendar.
We have had multiple guests who booked a Saturday & Sunday night stay but intended to book a Friday & Saturday night stay.
This causes problems later if the inn is all booked, as these guests cannot stay the night they expected.

the {DetailsHtml} placeholder returns a very basic however css coded part, showing as a different font style (and with different colors etc) from our confirmation letter. Ideally we could alter or influence this part directly.