There are a variety of other options for search that may make more sense. The primary is the ability to not only store a random frequency or talkgroup but to record it and play it back later. The recordings will capture not only the frequency and/or talkgroup but also the audio to help identify it.
Storing a frequency or talkgroup without capturing the audio, etc. that goes with it isn't really of much value. Depending on how your search is configured, things the radio stops on could be clear voice, paging, encryption, trunk system control channels, or even just static.
One of the great things about the Whistlers is that you can selectively record. That is - for example, if you have a busy trunk system, you can set the wildcard to record only the wildcard hits and not the rest of the known activity (unless you want to).
Set your searches to record to the SD card and then analyze the results of the recordings.