(CRM4) Redirecting to a Sales Order based on a Custom Argument

Hello,

In CRM 4 I would like to know if it's possible to redirect to a salesorder record without providing the ID of the record:

This would be the default redirect URL for a Sales Order.

<http://crmiis/Company/sfa/salesorder/edit.aspx?id=%7bADE420B4-3B55-E411-BA4C-00155DC80D07%7d#>

I would like to know if it's possible to have an alternate URL (still redirecting to a salesorder record) that uses a custom querystring parameter such as :

http://crmiis/Company/sfa/salesorder/edit.aspx?CUSTOMFIELD=VALUE

Where CUSTOMFIELD is another field on the salesorder form (it has unique values).

Thanks and hope someone can give me some insight.