Customer Specific 'Terms and Conditions' and 'Customer Notes' to Invoices and Estimates

I have clients for whom I need different 'Terms and Conditions' and 'Customer Notes' to appear on the Invoice and Estimates. Right now I am having to keep these in a notepad document and paste them in for each invoice and estimate that needs a change. Leaving the possibility for a mistake.

Could an option be added to allow for 'Terms and Conditions' and 'Customer notes' specific to that client/customer in the Customer area. The settings under Preferences for this would then be the default unless there are specifics added for a client. To me it would make sense to add something like this to Sales > Customers > Company Name > Add Settings tab. This would allow for future customization of Customer specific options.