So the request is very simple really, explained by the following figure:



The rationale is: you can save sensor curves but have them turned off and have that as the "default" behavior of the brush preset, but say you want to quickly turn on the size sensor, at the moment the quickest way is to go to F5 and turn it on in there, but I'm thinking, since we already have the sliders in the right click menu would be really great to have these toggles in there as well. Very simple but I think it can improve workflow quite a bit (depending on your painting style).

Another thing that came up and is especially useful for stamp brushes, it makes sense to have fast access to the brush tips. Currently you have to go through the F5 menu and make your way to brush tips, predefined, go through the list there so if you're on another setting like size you loose momentum. So my proposal is to have something like this only for brushes that are saved with predefined brush tips:



For this to work as intended though we'd have to save the brush tip settings (size, rotation, spacing) per preset, not per brush tip. The rationale here is that you want to change only the tip but not the settings. I assume that they're saved per tip because of historical reasons and due to the gimp brush tips usage, but I argue that it's better to save these options per preset.