We can benefit from MS Custom Translator (Microsoft Machine Translation improved with our own dictionaries) using the MS Translator Hub add-in into Passolo.
Such use requires to indicate a specific category to target the right Custom translation engine we want to use.
The problem is that Passolo stores this information for the whole projects. So, we must update the key each time we switch from a project to another to target the right engine.
It would really help if the information was stored to the project at least.