Marcos,
I have been looking around the web and it appears that the scheduler engine, which is based on JMS Topics triggering message driven beans, does not allow you to specify a "Target Node" to run the beans on in a clustered environment. This does not mean that it is not possible but I am not sure how to achieve this in a supported manner. I did find that you can do this with NW JMS Virtual Providers so you could in theory delete the MII one and create a virtual provider with the same name configured to do this. However, this is not supported to do and I have not tested it's operation either so it's pretty risky. Anyway, perhaps this isn't the right forum to ask this as this seems to be a core NetWeaver Java question so the NW Java forum may be better and you can of course reference this thread in your post there to tie the discussions together:
Hope this helps,
Sam