The upcoming release will include a feature to NOT update the URL when the topic title changes, which has the benefit that the old url is kept instead of having a 301 redirect to the new URL !
Unfortunately it's a global setting, so in the first version it won't be possible to set if it should be changed or not(like there are legit reasons where you would want to change it), but it's on the TODO list for one of the upcoming releases.
I don't remember who requested it via PM, but here we go:) Happy New Year!