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I have a problem, I want to enforce no vertical thrust from certain explosions independently of how compat_explode1 is set. But I don't know how to force in the flag inside A_Explode call. I tried this but it doesn't work.
It's simply set as the default value of the flags argument, so you just need to not pass the flag. (If you didn't want to pass in any other flags, you'd put in 0 instead)
That still throws me into stratosphere, I tried. It gets overriden by the compat option. I kinda need to enforce it not to use the Zthrust when exploding.