Unfortunately, its the nature of IRs to be a single waveform capture of a specific combination of cabinet, mic choices, mic positions, etc. So we end up with a huge list of choices, regardless of the amp sim used to host the IR(s). Only a few IR companies have managed to create a user friendly method of auditioning, choosing, and mixing IRs (such as mixir3). I know of no amp sim company that's done a similar thing (except for IK Multimedia in the Tonex software. with their VIR technology).
One solution is to use a fancy IR host plugin (such as mixir3, which is $)) with S-Gear as the amp-only front end, find/create your shorter list of favorites, then load those favorites into S-Gear. You can also create favorites and IR mixes and save them with more user-friendly names.