Greetings again,
I read through the source of DBD::Sybase and came upon this little snippet

# Calling sp_datatype_info returns the appropriate data for the server
+ that
# we are currently connected to.
# In general the data is static, so it's not really necessary, but ASE
+ 12.5
# introduces some changes, in particular char/varchar max lenghts that
+ depend
# on the server's page size. 12.5.1 introduces the DATE and TIME datat
+ypes.
[download]

might be worth investigating? If not, I think mpeppler is the author of this module, perhaps you can /msg him about this.

-InjunJoel