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The module is on its second rc, which means a lot of problems might have been resolved. However it is up to the developer to release the module, when he think it is ready. Until then the users in general should stick with 3.08.
If they have knowledge of PHP and MySQL, nothing stops them to use every kind of module on their sites.
But we will not advise starting or non expierenced users to take all kinds of risks to mess up their site. And we do not accept from you to give them ill advise. This is only counter productive for the acceptance of XOOPS as a valuable CMS platform.
The fact that NewBB 4 may or may not be safe to use at this moment, makes no difference.
It is up to the developer to judge it and to release the module for general use. Until then 3.08 rules!