Well don't yell at me because your poor wording made it hard for me to understand what you said. How am I to know when you say "/cline was easy to script" it means "you can easily use /cline to implement nick list coloring however that was added to mIRC anyway"? Saying "/cline was easy to script" says that it is easy to make your own /cline, if you don't see how that is confusing, well then I can't help you.

Anyway, making nicklist coloring doesn't even compare to this. To make the dialog for the nicklist coloring is gonna be 20+ lines, then the on text, on action, etc events and handling all that is going to be roughly 300 lines of code. This will be 3-4 lines of code. How does that compare?

Code:
alias swline {
  var %t = $line($1,$2)
  .rline $1 $2 $line($1,$3)
  .rline $1 $3 %t
}

Syntax: /swline @window N M
Desc: Swaps line N and M of the window @window

How can you compare that 3 line snippet to a 200-300 line script to create nick list coloring?