Using Emperors Throne Room. Claim want to use force speed special. Opponent claims that I can use the special but I forfeit the two actions because I claim. Now the rules state "for the rest of round, the player automatically passes all of their future turns and to act if they have the opportunity to take actions.

do I forfeit the additional two actions which is huge.

Yes you do

Technically you get them... and have to pass. Unless you just need to remove the die from the pool for some reason, you aren't coming out ahead in this situation.

Best case scenario is you are showing a 1 focus and your opponent has a force throw. Saves you 1 damage I guess.