Is there a one click way to convert a webarchive to pdf within DTOP? If not … this would be a feature I miss.
You can install CUPS-PDF.
Setting CUPS PDf as the default printer means that printing anything to pdf will only require using command+P and enter, but it won’t print directly to DTPO that way, unless you auto synchronize your CUPS-PDF folder with DTPO.
Perhaps someone else knows another way.