This conversation has been merged. Please reference the main conversation: Lightroom: Sort by more fields, sort by multiple fields
What happens if multiple photos have the same sort value, eg., rating? How are photos of the same sort value then 'sub-sorted'?
Typically this is handled by allowing multiple levels of sorting (eg., as Microsoft Excel does).
This would be even more valuable if LR supported sorting by any metadata field, eg., by title or GPS latitude or keyword-value (keyword-value pairs were supported, which I'll post separately as an idea).
Note that this could be implemented even in the current single-sorting-level paradigm by allowing sorting on values (-, 0, +) provided by user-defined scripts that would have read access to metadata. (The idea of supporting user-defined sort scripts was posted separately earlier.)