No, you just have to open sound.dat (in 'data\sound\se') in Notepad and enter the new SND's name after a comma on an empty line. So if your new sound is a "deathcry" you would name the file 0500.SND and type "deathcry' after the 500, in the sound.dat.
Of course, the main benefit will be when we can easily add/change enemy sounds. I just finished deciphering Enemy PRFs yesterday so that point may not be too far off. The PRF has some really cool spell customization features. Unfortunately, cpgen still isn't handling CPs right so some features (multiple spells and flame) may not be available in custom models till Mick works out the bugs.
Of course, the main benefit will be when we can easily add/change enemy sounds. I just finished deciphering Enemy PRFs yesterday so that point may not be too far off. The PRF has some really cool spell customization features. Unfortunately, cpgen still isn't handling CPs right so some features (multiple spells and flame) may not be available in custom models till Mick works out the bugs.