Hi John,
I would suggest to do it in the other way around.
Set the timeout in the configuration tool to the default, and increase the timeout for that specific operation.
I believe that you are experiencing a similar problem as discussed here, as Joao Rosado suggested:
1) So the normal recommendation is to break big activities into smaller ones.
2) Change that funcionality and implement it on a timer.
Please find more information about timeouts here:
https://success.outsystems.com/Support/Enterprise_Customers/Maintenance_and_Operations/Timeouts_Under_the_Hood
http://www.outsystems.com/forums/discussion/3486/guide-have-a-time-out-instead-of-timeouts-with-outsystems-part-iv/
Hope it helps you!
Best regards.
Daniel Martins.