can be done via the front end, but also can be done via MySQL;
find the template in the record table;
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mysql> select * from record where title like 'Default%' \G
*************************** 1. row ***************************
recordid: 2302
type: 11
chanid: 0
starttime: 07:23:56
startdate: 2014-09-06
endtime: 07:23:56
enddate: 2014-09-06
title: Default (Template)
....
maxnewest: 0
startoffset: 5
endoffset: 5
recgroup: Default
......
Change as required (eg, 1 minute offset);
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mysql> update record set startoffset = 1, endoffset = 1 where recordid = 2302;