I'm glad the workaround is working. Please, don't hesitate to send us all your suggestions. We always take it into account, when developing new features.
Regarding the multiple proxy feature, this is basically a LOD system. We have not implemented it until now, because may generate a lot of flickering when used on animations. Anyway, now that Forest supports multiple render engines, we'll repeat our tests, to see how it behaves with each one.