I've been giving Sublime Text a fair try as of late. I am normally a full time Vim/Tmux user. One of the biggest annoyances I have ran into while using Sublime's Vintage mode... I didn't have my "Sticky Keys".
After doing some research I found that, this isn't actually a limitation of Sublime. Rather, it's a "feature" introduced in Mountain Lion.
To enable "Sticky Keys" within Sublime Text, you will need to modify a system setting.
Fire up your Terminal of choice. Type or Copy/Paste the following:
defaults write com.sublimetext.3 ApplePressAndHoldEnabled -bool false
Note: to enable this for Sublime Text simply drop the 3 and replace with a 2
Now if you are of the daring type you can also override the ApplePressAndHoldEnabled at a global level as well.
defaults write -g ApplePressAndHold --bool false
Either option will get "Sticky Keys" working for you once again.