You can just click on the axes button (e.g. X, Y, Z, P, B....) and drag to move the value with the mouse.But you really shouldn't be doing that anyway. Stick with numerical entry and nudging and try to keep things in multiples of 0.50 or 0.25, at least for brushes, since Bad Things (tm) can happen if you put in too many random numbers.
Anybody else want anything minor changed?