Selective import of layers or keymaps

[kareltucek]

The number of layers could be easily increased to lets say 8. The upper four layers could be filled by importing another keymap as into these four slots via a command.

Furthermore, a command could be written that would selectively import a specified layer from a specified keymap to a specified layer on the currently active keymap (in RAM only). This could easily work on one half only.

Usecases:

• increasing number of available layers without having to workaround via keymap switches
• allowing locking just one half of a layer
• this way, setting up complex keymaps would be much more comfortable

[kareltucek]

More usecases:

• sharing layers between multiple keymaps
• dynamic construction of keymaps/layers (e.g., an import command which would overwrite current layer only by those actions which are not no-ops on the imported layer)