I've been playing with DayZ Editor recently and discovered if the Guard Tower if scaled up players no longer yeet themselves off the stairs while walking down, even while running!
I find scaling up to around 1.22x is the sweet spot to fix this. The windows are now slightly too tall to aim out of. but to be faire... WHO holds these towers since escaping is impossible without crouch walking down.
My work around for the high windows on my server has been to place some short crates to stand on, but a pallet would also work just fine.