You're right -- it would be cleaner to also use variables for the title and appname. The other variables that are available are (we'll also add this to the help):
%page% = Current page number
%total% = Total pages
%time% = The current time - displayed using the short form (without seconds) according to the user's current regional language settings.
%date% = Today's date - displayed using the short date format according to the user's current regional language settings.
%longdate% = Today's date - displayed using the long date format according to the user's current regional language settings.
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