Comment hotkey does not work

[wwerkk]

First of all, massive respect for making this package, I cannot express how pleasant it is to be able to write genexpr code without the usual codebox masochism.

I have noticed that the comment hotkey (CMD+/) does not seem to work.
After inputting sublime.log_commands(True) into console, pressing the hotkey combination prints:
command: toggle_comment {"block": false}

I guess this is related to Sublime not being aware of what is the suitable comment syntax in case of genexpr.

There is a dirty fix of editing /Users/wwerkowicz/Library/Application Support/Sublime Text/Packages/User/.tmPreferenceswhich worked for me, but I'm sure it could be done better and perhaps by default.
For reference, my .tmPreferences file looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>name</key>
    <string>Comments</string>
    <key>scope</key>
    <string>source.genexpr</string>
    <key>settings</key>
    <dict>
        <key>shellVariables</key>
        <array>
            <dict>
                <key>name</key>
                <string>TM_COMMENT_START</string>
                <key>value</key>
                <string>// </string>
            </dict>
        </array>
    </dict>
</dict>
</plist>