Swarmtool supports specifying additional fractions. In the same vein, it should support specifying additional dependencies for things like JDBC drivers.
Specific scenario: I'm trying to run an EAP quickstart that uses a database (H2). I build the quickstart, run Swarmtool over it to produce a Swarm uberjar, and then run the uberjar. An H2 database is expected, but it's missing. If I add the H2 dependency to the quickstart project, it becomes a part of the WAR, so Swarm doesn't find it when it's deployed. I believe I should be able to specify a dependency on H2 when running Swarmtool, so that it behaves similarly to the Swarm Maven plugin.