As long as the tools have a command line, you can integrade them into diskspan gui relatively easy using callbefore/runbefore/callafter/runafter. It looks like MagesPack tool has gui only, so no integration into diskspan gui is possible.
However there is a bms script (
http://aluigi.altervista.org/bms/chaos_child.bms) which you could use with quickbms, and quickbms you can integrate with diskspan gui
Edit: literally 90% of the game files contain just PNG images. Use xtool:d1:mpng:mreflate
Code:
chara.mpk
Streams: 1706 / 1706
Time: 00:02:36 (CPU 00:14:37)
Size: 833 MB >> 3.02 GB
se.mpk and voice.mpk contain OGG files. Use oggre on them.