Edited The issue (#347688) has been fixed in Sitecore CMS 6.5.0 rev. 120427 (6.5.0 Update-4) and DMS 2.0.1 rev. 120427
We have been asked to explain where the editor can customize the campaign tracking url, they have seen the feature when participating in Sitecore Training sessions, but can't find the features in the our platform that is currently fully updated.
It seems to me the feature has been removed otherwise it is hidden in {3AC13180-912F-4388-AF56-46A0F1172E70} that is missing in the DMS Installation, when looking at the insert options for the Campaign Item.
Does anyone have insight on the topic ? and if the feature is still present or has been removed for another model.
OMS / Custom Campaign tracking URL
When looking at the old documentation for Sitecore OMS the section related OMS Creating Campaign Events, it should be possible for the Editor to personalize the incomming url parameter that triggers the page visit to attach to a specific campaign.
Reference: "OMS Creating Campaign Events" page 13-14 http://sdn.sitecore.net/upload/sitecore6/64/online%20marketing%20suite%20cookbook-usletter.pdf
Engagement Analytics / No Custom Campaign tracking URL (?)
In the new DMS 2.0 / Engagement Analytics there are also Page events, and they should be attachable to Campaigns. But we can't seem to create anything under the Campaign definition even tho the first line in the documentation suggests it. Looking at the Insert options on the campaign there is a missing id: {3AC13180-912F-4388-AF56-46A0F1172E70} that suggest the installation is missing an Item for this feature to function.
Reference: "Engagement Analytics Page Events" page 6-7 http://sdn.sitecore.net/upload/sitecore6/65/engagement_analytics_configuration_reference_sc65-usletter.pdf
Campaigns
You can associate events with specific campaigns. To register a campaign event, beneath the campaign definition item, insert a campaign event definition item using the System/Analytics/Campaign data template. You can activate the campaign using the value of the sc_camp query string parameter or you can assign a campaign to a content item, such as a landing page. For more information about campaigns, see the section Campaign. To change the name of the sc_camp query string parameter, see the section The Analytics.CampaignQueryStringKey Setting.