So normally those are there if a user installs with "only for me" type installs. Here is a doc for what is returned http://community.landesk.com/support/docs/DOC-4456
You would have to write a script to copy the data you want to see into a registry hive that LANDesk picks up
Or I think in 9.5 we have the ability to take a WMI query and import the results into inventory.
Another path is that the programs installed on a device are most likely picked up with SLM and can be tracked via SLM.
The problem is that to get the data with putting into a registry hive I would have to know what the data was before I could import it into inventory. If I query my custom data for two values and there is a third at some point, I miss the third. Would WMI be able to return all the values under a specific key? I thought it was also a retrieve one value type of thing.