Actually there are several things that would be great to automatically configured through a keystroke. For example, brushes can be changed with Alt+1, Alt+2, etc. but I think that we should be able to bind one of these shortcuts (e.g. Alt+1) into a specific set of options.

For example:

• Alt+1 change brush size=1px, ink=simple ink
• Alt+2 change ink=shading, and selected color range [3,4,5] indexes.
  etc.

These Alt+1,2,3,4... shortcuts should be configurable using a special UI with options like:

• Brush: Don't change / Use this: [ OPTIONS ]
• FG color: Don't change / Use this: [ FG ]
• BG color: Don't change / Use this: [ BG ]
• Ink mode, opacity, etc.

This might be related to #475, we could assign "macros" to keys, so steps would be something like:

1. Record macro
2. Select an ink, brush size, or other things/tasks (e.g. switching a specific layer visibility, executing a command, etc.)
3. Stop the macro-recording
4. Assign a specific key to that macro

Things missing to close this issue:

1. default shortcuts (we have already the commands that can be customized by the user)
2. "quick peek" modifier to change the ink type temporally when the key/modifier is pressed

I'm not sure about default shortcuts to change the ink type. The preferred way to switch between brushes/ink types will be Alt+1, Alt+2, etc. which should be implemented soon (see #904).

Also, the "quick peek" behavior is a little complex to be implemented for v1.1, I think it should be separated to other issue.

I'll move this for v1.2 as I think after #904 this feature will not be required anymore.