Actually, there is not a function in mIRC's scripting that I don't believe I've ever not used, except COM objects and DDE....simply because at this point in time I never bothered about using them.
Who argued multi-server would be a useless function? I didn't meet anyone on IRC ever that didn't want a multi-server feature to mIRC, this coming especially someone like myself who makes VERY HEAVY use of it. There are a few things I'd like to add, example, on *:text:<text>:<channel>:<network>:{ }, but otherwise it works very well.....with the exception of a bit of cpu usage concerns that I made in the bug reports section.
Again, this is a completely aesthetic option to mIRC that you're requesting, i.e. using icons and images to represent text, and it's really not a functional feature, so I say stick with the DLL support. That's why it exists.
