Hello Bakari,
You are correct in that voice memo files can not be named. They can be assigned a custom label, but these labels do not show up as the file name when synced with itunes. Although I purchased italk awhile ago, I abandoned it's use as transfering the files to my computer proved unreliable for very large files (10 minutes +). The voice memo app, although not as feature rich as italk, is proving itself to be devoid of transfer problems with large files. I'll stick to voice memo for this one reason only and endure it's current lack of sophistication.
iTalk vs. Voice Memo