The basic discovery.php script has a nice parameter you can pass (-m) to only poll one particular module. I use this to poll ARP/FDB tables on a more frequent basis for certain devices.
It would be nice to be to give something similar to the discovery-wrapper.py script so that I could make use of the increased performance of parallelism/distributed pollers but to discover only a specific module. This has got to be a simple case of accepting the -m argument in the wrapper and passing it through to the PHP script as it calls it? Not sure if there is anything additional that would need to be done with memcache for distributed pollers here…
Also nice would be something similar for –type or any of the other discovery.php options really.