That's a bummer. We are in the same boat. It would be really nice to have this feature. A lot of us are using Talend in an integrated project with other java components. It would also help with security as well to not having hard-coded connection string in JDBC. This should be on the radar for the future version of TIS.
I can send you a talend component for manage connections pool. It's a custom tJDBCConnection component. I couldn't attached it in this forum. Send me an email to firstname.lastname@example.org and I'll send you the code and the installation instructions