onError function in Application.cfc

while use new functions come mx in application.cfc still don't have feel of them. below use onerror function based on other peoples code , own experience. tweaking used generic function.

<cffunction name="onerror" returntype="void" access="public" hint="fires when error generated not caught cftry / cfcatch">

<!--- gives info on error --->
<cfargument name="exception" type="any" required="true">
<cfset var except = arguments.exception>


<!--- if sessionexpiration becomes true redirect local home page--->
<cfset var sessionexpiration = false>
<cfset var redirecturl= "/index.cfm">


<!--- exit if exception caused cfabort tag or event handler --->
<cfif (arguments.exception "coldfusion.runtime.abortexception")
or (arguments.exception "coldfusion.runtime.eventhandlerexception: event handler exception.") >
<cfreturn/> </cfif>


<!--- sort out session variables after person has logged out? --->
<cfif structkeyexists(except,"rootcause") , structkeyexists(except["rootcause"],"detail")>
<cfif except["rootcause"]["detail"] contains "session invalid">
<cfset sessionexpiration = true>
</cfif>
</cfif>

<!--- using j_username paramters in login can cause
confusion session status after logout - tidy
expiring session , redirecting --->
<cfif sessionexpiration>

<cfcookie name="jsessionid" value="" expires="now">
<cfheader statuscode="302" statustext="moved temporarily">
<cfheader name="location" value="#redirecturl#">


<cfelse> <!--- real error show message , contact adminsitrator --->

<!--- supposed hand on control of error cferror tags --->
<cfmail to="#request.siteadmin#" from="someemail@someserver.com"
subject="error diagnostics" server="#request.mailserver#">
there error on: #request.thisaddress#
...................................................
brief detail is: #except#
</cfmail>

<!--- hand on cferror tags --->
<cfthrow object="#arguments.exception#">

</cfif> <!--- sessionexpiration --->

</cffunction>

<cferror type="exception" template="error_messages/general_error.cfm">
<cferror type="validation" template="error_messages/validationerror.cfm" >
<cferror type="request" template="error_messages/general_error.cfm">

apologies, submitted before got ask questions
1) why cfabort , handler exceptions appearing when didn't using application.cfm , cferror tag?
2) above code sort out status of session variables after person logs out? if not can dealt in function?
3) @ moment don't use cfthrow , cferror tags because keep getting template not found error despite same code having worked fine in application.cfm
i put i'm sure other people must running similar issues. comments welcome!

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