In R80 we introduced multiple ways to navigate a large rulebase. See What are some of the tips and tricks for jumping between rules in the rulebase?
In R80.10 we added this one small thing - jump to a rule by number.
Click on Actions-->Go To Rule
Alternatively you can hit the keyboard Ctrl+G
Type your rule number and hit OK.
Inline layers rule numbers are also supported (as well as inline-of-inline-...layers)
Go to rule by rule UID is also supported. If you have the UID of the rule from your private systems, you can type it in.
You can easily copy a rule UID by right-clicking and selecting "Copy Rule UID".
This feature is supported in R80.10 SmartConsole Access Control Policies and NAT Policies.