There's option to specify database type in your jdbc cache store definition e.g.:

<binary-keyed-jdbc-store datasource="java:jboss/datasources/ExampleDS" preload="true" passivation="false" purge="false">
        <property name="databaseType">SYBASE</property>
        <binary-keyed-table prefix="b">
        <id-column name="id" type="VARCHAR(255)"/>
        <data-column name="datum" type="VARBINARY(10000)"/>
        <timestamp-column name="ver" type="BIGINT"/>
   </binary-keyed-table>
</binary-keyed-jdbc-store>

The problem is that this property is never read, which for example means that user cannot use jTDS jdbc drivers, where infinispan is not able to guess database type from driver specification.
Note that I've tried to add this property manually as well as using CLI.