We regularly deploy existing sites to Cloudflare and would love this feature, I’m sure others would love this ability too as it would simplify making changes in advance.
I’d like to see a system introduced where you have two copies of your DNS records, a “live” copy and a “staging” copy where you can modify the staging copy without actually influencing the live records.
There would then be an option to synchronise the DNS records, compare DNS records and also restore revisions of the DNS records.
Something similar to how you see below
Of course this could be simplified to just have the live/staging and sync buttons only but adding a compare option + dns revisions would both be extra useful.
Overall though it would allow for much better control of DNS records.