[development] Improve multiple database handling

[Rowan Kerr]

On 18-Jan-07, at 3:42 AM, Gerhard Killesreiter wrote:
> I seriously doubt that. The performance hit would affect everybody 
> whereas the feature is hardly ever needed. The database layer already 
> needs more time than it should.

I would be surpised if something this simple really impacted 
performance, but if no one is convinced that it's the right thing to 
do, some benchmarking will need to be done :)

-Rowan