Custom 'Required' Messages

This would be a small convenience module for module writers using FAPI to allow developers to set custom messages when fields are not filled in. Basically, instead of things like "The field 'Do you accept these terms and conditions?' is required." you'd be able to set something like "You must accept the terms and conditions to continue." without writing their own validations for every form. I've already coded the module for use on my own projects, just wondering if this is something the community at large would be interested in.

In the future, I suppose it'd be nice to extend to CCK fields as well.