Is there a Cheater-Way to Lock Fields on a Form?

Just feeling the water; is there a cheater-way to lock the form fields, based on some criteria?

Issue:
We have some custom forms with 'dozens' of fields that need to either be all-locked or all-open, based on a date/expiration type criteria. I'm just curious if there is a "Disable All" type function, that will allow me to disable all value on a form - then re-enable one or two.... If there is such functionality - Please Share =D

So far - I think I'm going to have to do the Manual hundred lines of IF/Disable 100 fields and the grid Else/Enable 100 Fields and the Grid....

Thoughts / Suggestions?

(db)