This is a question for those in the know. I have only hunted Zim once. was in the OMAY. Game scout went everywhere and of course I tipped him at the end. Is it not a policy in Zim to have a game scout with a foreign hunter at all times?

Not on private land it's not!

Yup.

Looks like it is policy now, though.

There was one with me in the south omay in 2012. And he was with me at Rosslyn safaris near Bulawayo, which I am certain is private land.
I don't believe I tipped him, as he was an add on by the government and provided no value.
I do recall that he carried an AK47 and was very unsafe with it.
The second time my PH told him to stop sweeping the muzzle across all of us, he said "the next time I will take your gun."