If you don't find an answer to your question here, try the ExtendVS Gitter forum.
Q: How do I add my extension to the Visual Studio Marketplace?
A: The Visual Studio Marketplace is currently in preview. Continue managing your Visual Studio extensions through the Gallery. Once the Marketplace is ready, your extension will be automatically migrated to the Marketplace.
Q: I have a Visual Studio 2015 Extension, how do I add Visual Studio 2013 support for it?
A: Reference the 2013 assembly when you build instead of the 2015 assembly. Visual Studio 2015 contains a binding redirect to ensure it continues to work when you run it within Visual Studio 2015.
Features and bugs
Q: I have a feature request, how do I report it?
A: Submit your feature request at Visual Studio UserVoice.
Q: I found a bug, how do I report it?
A: Submit your bug report through the report a problem option within Visual Studio.