When right-clicking a session and going into the "Filter Now" context menu, there's a filter option at the bottom which filters by Content-Type. Very useful. However, when using Fiddler's ALT-click function on the session list, ALT-clicking on a particular session's Content-Type column value (in order to select all sessions with that same content-type), it factors in subsequent content-type parameters as a unique content-type.
For example, if back-to-back sessions for a particular website were content-types "application/json" followed by "application/json; charset=utf-8", ALT-clicking on one of their content-type entries in the Content-Type column would not select the other, since ALT-click would view them as different content-types. However, if you right-click either of them and Filter-Now by its content-type (application/json), this will filter both sessions despite the additional parameter appended onto the content-type of the latter session -- this is the more useful methodology, in my opinion.
The Filter-Now rule as it stands is the most/more useful of the two methods, since base content-type is almost always what's most important (in my experience).
Can the ALT-click functionality on Content-Type column values mirror the Filter-Now functionality in only looking at base Content-Type of a session? It would be most useful if so, especially since "charsets" can vary so widely/dynamically across sites, when trying to quickly hone-select on all sessions with application/json (or similar), for example.