Надо установить Rational Integration Developer (для краткости RID), но так, чтобы не слетел уже установленный, много раз проапдейченный, настроенный Rational Application Developer 6.0.1 (для краткости RAD). Опыт людей, устанавливавших RID, ранее и полагавшихся на инсталлятор, показал, что с RAD'ом потом работать уже нельзя — его перекашивает (в итоге RAD сносится). Можно ли как-то обойти данную проблему, например, доставить к RAD'у нужные eclipse'ские плагины, доложить библиотеки?

Вообщем я немного ошибся - не Rational Integration Developer, a WebSphere Integration Developer, но суть та же.

"# Application Developer for IBM WebSphere Process Server V6 and IBM WebSphere Integration Developer V6
The application developer is responsible for developing business services according to the architect's model. The application developer uses IBM Rational Application Developer to develop, test and debug application components using the J2EE component model, and exposes the application logic as a reusable service. The application developer also assists the integration developer in implementing complex business processes, using Business Process Choreographer, that consume Web services in IBM WebSphere Integration Developer.

# Integration Developer for IBM WebSphere Integration Developer
The integration developer is responsible for the assembly of application components into a complete solution, and the preparation of this solution for thorough testing and subsequent deployment. The integration developer enables access to a range of data sources for the general application developers, which may include establishing relational views over federated sources (heterogeneous relational databases, data access layer developer queues, or Web services), writing entity beans to enable correlated access to federated sources, or developing Web services that provide access to federated sources."

WebSphere Education