As far as I know, Komodo 4 was the only version that featured the LimitStrength option, and that version had major problems with time losses at lower strength levels.
Rating of Engine

Dude, if you want to know anything about engines. I'm the man to look for.
On Arena, follow these steps to reduce komodo's playing strength.
Go to Engines --> Manage Select Komodo and go to 'details' Under 'details', select 'special' You should see an option called 'strength(%)'. It's default value is 100, but you can change it to anything you want.Well, that will sort of work, indirectly. It doesn't limit the strength of the engine directly, but it does reduce the calculation time of the engine.
How can I change Komodo's rating on Arena or Shredder interface? It doesn't working. Deep Shredder gui can changing but new engines not.