We have now added SmartFoxServer Cluster support to our offical HTML5/JS client API.
We just released SFS2X patch 2.18.2 which provides a series of features that have been requested and launches updated client-side APIs for all supported platforms. You can read the release notes and proceed with the download from here.
The latest client API can be obtained from our dedicated download section.
Please note: the patch requires SFS2X 2.18.0 to be already installed.