My idea

I AM SO SORRY, I AM AWARE THIS IS A REPEAT REQUEST.

It is now possible to put delays (in seconds not ms) in action scripts via changing variable values, if statements and the "Uptime Seconds" placeholder. So, why can't we just use a similar system for waiting but in ms and as a single insertable block? The original problem was something to do with the game ticks but the uptime has nothing to do with that as far as I'm aware. There could be something big I am missing though.

I've just seen many people asking for this and it doesn't seem like it's impossible idk.

What you mean is not a "wait". If you would actually "wait" inside an action script, you would freeze the whole game. What you probably want to do is actually not more than a Ticker that runs all the time and basically does nothing until a variable reaches a specific number after counting up some time or similar. This is the only way to "wait" without freezing the game and there is no way to make a block for that without confusing the hell out of users who actually see a "wait" as what it is, so they would thing the script actually waits then, which it does not do.