Here would be a patch that should allow to have comma delimited blacklists (in addition to the multiple blacklist boot codes option):
--- tc-config-orig
+++ tc-config
@@ -101 +101,3 @@
- echo "blacklist $i" >> /etc/modprobe.d/blacklist.conf
+ echo "$i" | tr ',' '\n' | while read j ; do
+ echo "blacklist $j" >> /etc/modprobe.d/blacklist.conf
+ done
That means that "blacklist=first blacklist=second blacklist=third blacklist=fourth" and "blacklist=first,second,third blacklist=fourth" should both create the same '/etc/modprobe.d/blacklist.conf'.