SupportCenter Plus - How to best integrate 'Business Hours' Functions into existing reports/columns?

Hello!

I've just found that Analytics has a set of Business Hours/Days functions available when building custom columns. Unfortunately, these don't seem to be included within the default columns.

Has anyone altered the existing columns to include these functions? Specifically (but not limited to...):

Time Elapsed
Time Elapsed in Hrs
Time to Response In Hrs
Days Since Request Updation (?)
Days Since Request Updation- Age Tier
Time to Assign in Minutes
Time to Resolve in Minutes
Hours to Complete Since Initial Response
Time to Resolve in Days

Additionally, have you also included exceptions for known SLA's which ignore business-days (eg. Severity 1/2 or Priority 1/2 issues)?

I feel that the existing reports that DO NOT include Business Hour considerations may be artificially inflating both response and resolution duration.

Thoughts?