I have an idea: the symbol %number-addresses-ever% to be able to count the ips in a folder where is paste (with diff template). Is it possible?
The feature you are asking appears like a single/individual necessity.
Since we can't have a command for every individual necessity (they are thousands),
i'm planning a scripting system, to let you control things finely.
I'm trying to collect such "indivual necessities" to figure out how should this system be.
Don't expect your need to be satisfied soon.