We have introduced many options around this over the years - in latest Studio 2017, we have:
- File - Options - Automation - "Perform automated lookup on confirmed segments" - turn this off to avoid MT lookups on confirmed segments (which also applies to MT segments which you have post-edited and confirmed)
- In Project Settings - TM - Search - "Look up segments in MT even if a TM match has been found"
Hence setting "Idea delivered partially" for now.