I wrote a little plugin to mount a cmis-folder as an efs-folder (Eclipse file system) in eclipse. Well to be honest I just modified the one which you can find here, so most of the work was already done for me.
You can install the plugin by adding the following update-site: http://www.johnen.biz/efs-cmis/.
The sourcode can be found here.
To mount a folder you have to right-click on the root-node(!) of your project and select New -> New CMIS Linked Resource. And enter the parameters which I explain below.