Configuring conflicting keys via .ideavimrc

IdeaVim allows defining handlers for the shortcuts that exist for both IDE and Vim (e.g. <C-C>).

vim

" Use ctrl-c as an ide shortcut in normal and visual modes
sethandler <C-C> n-v:ide i:vim

This option consist of an optional shortcut and a list of space separated list of handlers: mode-list:handler mode-list:handler ...
The mode-list is a dash separated list of modes that is similar to guicursor notation and defines the following modes:

n - normal mode
i - insert mode
x - visual mode
v - visual and select modes
a - all modes

The handler is an argument that may accept the following values:

ide - use IDE handler
vim - use Vim handler

Examples:

n:ide - use IDE handler in normal mode
i-v:vim - use Vim handler in normal, visual, and select modes
a:ide - use IDE handler in all modes

By using sethandler you can define handlers:

For a single shortcut: sethandler <C-A> n:vim i-x:ide - use Vim handler in normal mode and IDE handler in insert and visual modes,
For all shortcuts: sethandler n:vim i:ide - use Vim handlers in normal mode and IDE handlers in insert mode.

If the definition of the handler is missing for some mode, it defaults to vim: sethandler <C-X> i:ide - use IDE handler in insert mode and Vim handler in all other modes.