Hi Stan,
At present, there is no CLI / GUI option to configiure CPU alarm on the WAE. The high CPU alarms are caused by either HW failure or SW issues on the box which causes other major issues on WAE which ultimately raises the related alarm.
You can configure your monitoring tool threshold to anything above 80%. WAAS CPU spiking upto 60% should be considered normal as heavy traffic, particular traffic pattern could cause the CPU to spike upto 60-70%.
Hope this helps.
PS: Please mark this as Answered, if this answers your question.