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To get rid of the older versions of the process, the best option is to un-deploy the older version before deploying the new version. That way you can keep only the current version you are developing.  

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BPS Transports

How can I invoke a business process through JMS or talk to a partner service using JMS?

This article (http://wso2.com/library/articles/2012/01/configuring-jms-transport-in-wso2-business-process-server-bps)  describes how you can use JMS transport in BPS

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Human Tasks

Can we assign potential owner as direct user id instead of role/group in human tasks?

Humantask implementation is based on OASIS WS-Humantask and Bpel4People specifications. According to that people assignment is always a list of users or a list of unresolved groups of people [1] [2].
You cannot assign a user, instead you have to create a particular role/group and assign the user to that role/group.

[1] http://docs.oasis-open.org/bpel4people/bpel4people-1.1.html [3.2 Assigning People]

Assigning People can be done in different ways.
(I)Via logical people groups (“Using Logical People Groups)
(II)Via literals
(III)Via expressions

[2] http://docs.oasis-open.org/bpel4people/ws-humantask-1.1-spec-cs-01.html