Multiple On-Premise Data Gateway per query/mashup

Currently, all queries in one 'project' must use the same On-Premise Data Gateway. Not sure why it was designed this way, but in order to use a datamart like a datawarehouse and combining multiple sources, there can't be just one gateway.

Suggestions:

• Possibility to use mutiple gateways per project;
• Possiblitiy to NOT use a gateway for a source/project (cloud resources), when combining with resources that need one
• Possibility to add multiple projects per Datamarts, so the limited use of one gateway isn't a problem.