Sluggable custom entity manager

[Tetdoss]

Hello, i have my custom entity manager and i wonder if it is possible to use it with sluggable ?

If not, here my issue :

I have a table like this

slug |config_id
foo | 1

When i add a row (foo,2) , slug generate :

slug |config_id
foo | 1
foo-1 | 2

But i'd like an unicity based on the 2 columns like that

slug |config_id
foo | 1
foo | 2
foo-1 | 1
........................

Thank you if you can help me !