In my previous post I documented the limitation of SP2013 and SkyDrivePro related to document libraries that are created using custom list definition. I found one workaround for this.
In your list template element specify the Type=101 (DocumentLib) and DocumentTemplate=10000. You must also specify the FeatureId attribute. Id of the Feature that deploys the List template element.xml
Adjust your list instance also with TemplateType=101 and include the FeatureId Attribute.
There you go, now we have the SYNC button.
Note that if your Event Receiver is targeted to the custom list template id (eg ListTemplateId=10000), it won’t fire. So you should change the target to the specific list instance by using ListUrl attribute.