The permissions to manage DTS Packages should have already been granted to public (i.e. everyone). To confirm, run
exec msdb.dbo.sp_helprotect @username = 'public'
The output should include execute rights for stored procedures
sp_add_dtspackage, sp_drop_dtspackage and sp_get_dtspackage
amoung others.
SQL = Scarcely Qualifies as a Language