SublimeText plugin used to auto switch input method to U.S. on vintage command mode. This plugin help Asia users to avoid switch input method between U.S. and local lang input method. This plugin work on OSX only.
First, You need install this with Package Control. And make the file "im" to execute able. run command like below.
chmod +x ~/Library/Application Support/Sublime Text 3/Packages/IMSwitchForVintage/imWhen you editing text in vintage insert mode. By default, Press Esc key will exit insert mode and auto switch input method to U.S.