1) Edit>Preferences>Tool options>Paint options shared between tools
2) You can save "tool presets" (see the row of icons at the bottom of the tool options dialog) where you can save complete tool settings, for instance brush+size+dynamics+smooth line options.
2) You can save "tool presets" (see the row of icons at the bottom of the tool options dialog) where you can save complete tool settings, for instance brush+size+dynamics+smooth line options.