Whether 'scripting' will be easier with such a program depends on the person who is doing it. To create scripts requires sufficient knowledge of C++.
As for the open-source, my design is based on a static dynamic design. That means that the structure of the program is extendible, but it does require recompiling (and thus having the source).
I do want to emphasize the advantages for server admins. Many don't have the ability to run mIRC 24/7, and due to that choose to not run scripts (I also know an admin who _does_ run scripts, using mIRC under vmware in linux, a bit CPU-intensive for some little scripts, don't you think?).
Besides that C++ opens more possibilities (for example, MySQL logging to create an interface to PHP, as well as much more).
To sum it all up, MTAMA is limited and slow, and the mIRC scripting language isn't the neatest language around...
This program should act as a replacement.
(p.s. The idea just popped into my mind that it maybe is possible to not be fully open-source through releasing precompiled static link libraries for the common platforms. Yet, if it's possible, I don't think it's a very neat solution... )