Folks, I have just joined a company where they are using WSAD 5.1 which is painfully slow. Their rationale for using it is taht the final deployment will be on Websphere server. I am used to Eclipse Europa and similar with JBoss as my app server. Is there a way that I can use Eclipse with Websphere app server?
Well, guess what? You work for them, they don't work for you :-)
You have two options that I can see.
1/ Go through all the rigmarole of trying to change their mind and letting you develop on baseline Eclipse (which may not be that difficult if you focus your arguments on, and quantify the benefits to be had); or
2/ Just set up and support your own installation of Eclipse/JBoss for development and introduce an extra local step testing with WSAD/WAS before pushing your code to the repository.
If you hide (2) well enough, they need never know. But check your corporate policies first, they may not allow unapproved software on their machines.
The thing is, if you have a good boss, they may allow this regardless if it means your productivity is higher.
The problem you have is that IBM's products (WSAD, RAD, RSA et al) all have very good integration, and possibly some subtle vendor lock-in ("advanced features"), with WAS which is harder to set up with the baseline Eclipse. That's something you'll have to figure out and maintain.
Your employers will be unlikely to help with that, or even condone it since, in their eyes, they have a solution: use WSAD. You need to convince them that the cost of doing it your way is outweighed by the benefits.