I found two options in doing this, one is by using plugin and another is by doing some modifications to JIRA. Please check on the following links:
Thanks Zulfadli Noor Sazali !!
<web-item key="edit-issue" i18n-name-key="webfragments.view.issue.opsbar.operations.top.edit" name="Edit this issue" section="operations-top-level" weight="1">
<param name="iconClass" value="butt-edit"/>
.......this is the web item for 'Edit'......so can i add new conditions to it???(by extending the available classes...i suppose)....or its not possible???
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