Hello Mark,
This question is quite old but still raises a very important problem.
I've tested SAP/BO BI4.1 SP7 + AES-128 and AES-256 for Kerberos on these env. :
Windows Server 2012 R2, BO BI 4.1 SP7, Tomcat7, JRE 8, Windows AD, SQL Server 2014
Windows Server 2008 R2, BO BI 4.1 SP7, Tomcat7, JRE 8, Windows AD, SQL Anywhere 12
it works great !
I'm going to write a dedicated message to insist on that: throw RC4 away, adopt AES !
Regards,
Stephane