Mapping leader key to execute something without having to press enter

Question

I mapped leader lf to LustyFileSystemExplorer and it works properly. I press leader lf and it shows the explorer, however when I change it to any other key binding, pressing leader lf shows :LustyFileSystemExplorer and I've to press enter to use it.

Answer 1

Add a carriage return to your mapping:

map <Leader>lf :LustyFileSystemExplorer<CR>

And you're done!