While I am not aware of any change set editing tools, there are definitely tools out there that can help with Salesforce deployments. In fact, if possible, I would avoid using Salesforce Change Sets altogether. They do not comply with the deployment best practices of modern software development. There is no risk analysis, a lack of visibility into the changes being rolled out for release, no insights into the business impact and associated vulnerabilities, etc. This blog post covers these and other shortcomings encountered by Salesforce experts when implementing change sets.
Few devs/admins in the Salesforce industry are aware of tools that can help with Salesforce deployments. But they do exist. There are cloud-based Jenkins Solutions and various software vendor apps such as Gearset that help with Salesforce deployments. And even fewer know of risk mitigation and risk planning, which can be achieved via software such as Panaya’s Release Dynamix for Salesforce.
*Full Disclosure: I work for Panaya