Allow to limit results in "Filter By" for lookup and customer fields on views

Often you have different flavours of an entity, lets take account as an example, where you could have "business accounts" and "private customers". If you now want to filter a lookup field, e.g. on an opportunity, to only return "private customers" you can apply a view to this lookup field on a form. But if you now create a system view including this field and a user wants to filter this view by a certain customer, the filter is no longer applied (like on the form), but all accounts are returned. Please add the functionality to apply a view to limit results returned on a filter in views. thx a lot Thomas