I am not sure if global SO would be suitable for this.
If you need these features I would suggest looking at using StackExchange.
I can foresee the community closing these question fairly quickly, and since tags are controlled by the community, it can be here today and gone tomorrow. I don't see it working as a support forum, however people could ask question around the platform if they are generic enough. Specific questions however may be a problem. Also having a set of tags specifically for this purpose will become a headache over time.