Addding an event before the load of collections

An event triggered when loading collections would be useful for performances. The use case would be batch querying some stuff instead of doing a query per object of the collection in a postLoad event.
For instance, the Translatable extension from https://github.com/l3pp4rd/DoctrineExtensions loads the translations on postLoad which result in many queries. Being able to load them all in a single query would be useful.