Consistent Keyboard Shortcut/Hotkey Behavior

tldr: hotkeys change values by 1 and [Shift] + hotkeys change values by 10.

Sliders currently behave inconsistently between the tools, which makes it challenging to use to a tablet-focused workflow.

Current Behavior:

Up/down arrow changes slider values up/down by increments of 1 (brush size, opacity), 0.5 (rotation angle), or 0.01 (texture size, offset, HSBC, softness)

[Shift]+Up/down arrow does not change the above behavior

Left/right arrows do not alter values in sliders (i.e., don't make the slider move more to the left or right…)

Up/down hotkeys change slider values up/down by increments of 5 (opacity) or 1 (brush size)

[Shift]+Up/down hotkeys change sliders up/down by increments of 10 (opacity and brush size)

Desired Behavior:

Up/down or right/left or assigned hotkeys change slider values up/down by increments of 1 across all sliders

[Shift]+Up/down or right/left or hotkeys change slider values up/down by increments of 10 across all sliders

[Alt]+up/down or right/left or hotkeys change values by smallest amount possible (in same way that holding Alt makes mouse rotation smaller)