Yes and no, but yes! You have to think outside the box to get to those heights.
Not trying to be clever, not trying to deride anyone elses` theories. Some of us are here to experiment and in doing so we find ways to push the boundaries. Once upon a time it was frowned on to go to the city below the Zaby, where now it is accepted. In that spirit of scientific experiment only I present but one way to reach for the stars.
First off I had to remind myself of the limits and check nothing had changed. So yes, the Prop Edit
allowed my dared for Y axis of 150000 (150,000). I then changed this to around 98,000 and went there. Adding a startpoint.
I did this because when I tried to make a "Go To Location" link the system changed my 170,000 to 100,000, which is the limit for the "Go to Location".I then cloned the floor and placed that one at Y axis 200,000 and added "Fly" to the rules. I flew up there and dropped on that floor then added a StartPoint to it. I have now tested this StartPoint and can go directly to level (Y axis) 200,000 (or 200000) in the Prop Edit. I know from previous attempts a long time back we can go a lot higher than this but have to do it by alternative means. I tried this in an unlocked Zaby so there was no system block involved, I will not hide this important fact.
Currently stood on the floor in the 2nd pic from the top at Y axis 200571. I used the StartPoint editor to send me to the ground level then the same editor to 200571. If I put a prop in and link it to that floor that will also work no problem as long as I use a Go To StartPoint. There is no physical system block in this property. The only block or limit is 100,000 in the "Go To Location", this does not physically stop you going there by other means. There is a way to get to any height without flying there but it's not a normal part of the Prop Edit and only experimental stuff.
NOTE: My nick and image are from a company. That company allows people to use them both as long as they get permission and a licence. I have that and a certificate to prove it.
"These are not the Druids you are looking for..."