I have the equivalent of a timeline with individual objects that can have many options. The issue is that the visual representation must remain constrained to easily read the timeline. The current plan would have a flag to indicate if advanced settings were set for a particular item so that the user can contextually view that information.
The problem arises with the user who needs to build the timeline, they need a way of inserting the meta data. Some options are simple toggles, feature on/off, which is easily handled in a context menu. However some require entering values in. There are examples (few and far between) of context menus that have form elements in them.
For example, Microsoft uses an additional context menu above the regular context menu for font controls. This includes a dropdown and input which control font and font size. This meta data about the font and size is viewable and modifiable from the context menu.
Other examples could be Adobe Photoshops use of Pallet (windows or docked) that provide the form out of context from the selected object. (this however requires objects to support being selected)
Summary of the Question: How best to solve for entering in a large number of options when the interface is restricted from having a large form present.