>>26443174I think sai just automatically detects your tablet's drivers/pen pressure settings, is it dead? the only way to really change settings I think is to go directly to your tablet's settings and messing with those. If it's just dead try either resetting any personalized user settings your tablet might have or restarting your computer.
or if you just want to make a brush more or less pressure sensitive you can mess with the hard<->soft setting under the advanced settings thing on any brush, pic related