Xournal is a Pen Journal that also allows you to add annotations to PDF files and/or capture and import arbitrary windows on the current screen to use them in xournal.1)
Xournal has a configuration file stored as ~/.xournal/config. In it, you can change or set many more options than the gui lets you change (as well as all the options the gui lets you change). For example, the resolution of imported PDF files, many default sizes and location and much more. It is internally documented and in plain text. If you changed button two to be a highlighter as shown above and you want the highlighter on button two to always use the ruler, you can do that in the config file by making 2 changes:
Change ??btn_linked?? and ??btn2_ruler?? to match these lines:
# button 2 brush linked to primary brush (true/false) (overrides all other settings) btn2_linked=false
# button 2 ruler mode (true/false) (for pen or highlighter only) btn2_ruler=true
Now the highlighter on button 2 will always use the ruler, this will not affect the regular highlighter.
— Greg Priest-Dorman 2008/10/24 10:12