Is there any way to temporary hold the opacity/power on 100%

[Soom]

When I use a brush, that has opacity and size settings linked to pressure, and then use the right click eraser to quickly delete lines, I can never delete them precisely (because pressing too soft for thin line, makes the eraser also transparent, so drawing is not deleted, but pressing hard for 100% opacity, the brush becomes too big to erase lines precisely). I would like to have a button, that temporary invokes 100% opacity, so that I can still use soft pressure for thin line, but get 100% opacity, temporary overriding the brush setting, while holding the button.