To be clear, you changed
local key = "PageDown"
to
local key = "SHIFT-Mouse5"
?
Or did you do all 3 (Freezing, Tar, and Binding) as Mouse5, CTRL-Mouse5, and SHIFT-Mouse5 respectively?
Edit: Sorry I had the wrong syntax, I checked my bindings-cache.old and its BUTTON5, so you’d want SHIFT-BUTTON5 in your case.