How can the email listener be configured to react on a different subject pattern like "Task# [Number]"?
How to use the object pattern is described in the online help > http://support.frontrange.com/common/files/support/heat_cloud/user/index.html#configure/email/inbox_configuration.htm
scroll down to section:
Using the Object Name Mapping Tab
Alternately in Heat 2014.3.1 release an XSLT file can be used to do further enhancements.
If customers need further help then please contact Professional Services via your account manager.