SQL Server 2008 R2 Standard with SSIS Enterprise I currently have SQL server 2008 R2 Standard installed with SSIS. I need a SSIS feature that is only available with the enterprise edition. Is it possible to upgrade SSIS only to enterprise while keeping the database install as is (standard)?
No. The only way to license SSIS enterprise features is to get SQL Server Enterprise Edition.  Your other option is to implement the functionality in some other way such as a stored procedure, TVF, or .Net code embedded in the SSIS package (e.g. a script task).