Can standard OFS actions be enabled from hosted Plug-in?

Summary:

We like the feel and look of the Assignment Assistant when the Move Activity action is initiated, and wondering if anyone has had success in deploying that within a hosted plug-in framework?

Content (required):

Since Notes are not available to be part of the Move Activity (a true free form, rather than move reasons), we are looking to build a plugin, but I do not want to eliminate the Assignment Assistant functionality.

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