https://github.com/vlevit/key-seq.el.git
git clone 'git://github.com/vlevit/key-seq.el.git'
key-seq.el provides a way to map pairs of sequentially but quickly
pressed keys to commands. It includes two interactive functions:
key-seq-define-global and key-seq-define which are complementary
to key-chord-* functions found in key-chord.el. The difference is
that key-seq-* functions produce bindings only in a defined key
order while bindings defined with key-chord-* are symmetrical.
The package depends on key-chord.el and it requires active
key-chord-mode to work. Add this line to your configuration:
(key-chord-mode 1)
Then you can define key sequences like this:
(key-seq-define-global "qd" 'dired)
(key-seq-define text-mode-map "qf" 'flyspell-buffer)
For key delay and other customizations see key-chord.el documentation.