actually we do not use slide security (yet). all data is accessed through the "root" role and we have custom security checks in front of it.
I know that you can implement the security manager in slide by implementing org.apache.slide.security.Security . Perhaps this can solve your issues.
Also there is a wiki that contains that : http://wiki.apache.org/jakarta-slide/Security
Also that could be worth reading it : http://wiki.apache.org/jakarta-slide/JNDIPrincipalStoreSetup