The report is possible, I suggest reading and going over the Doc's and stickies on the how-to boards if you dont know how to do this, they cover it very well,
http://www.pokertracker.com/products/PT3/docs/?doc=custom-reportshttp://www.pokertracker.com/forums/viewtopic.php?f=45&t=22599 #Hands#>500
For the report, go to the report tab, in the selection area select "xxxxx Player Statistics". Next look to the Available stats section, double click ALL STATS, add the stats from the list by double clicking its name.
Directly above the Available Stats section are "Filters, Sorting, Advanced" all highlighted in blue, click "Filtering". First thing is to UNcheck the "filter on active player" checkbox. This makes the report run over all players in DB. To filter to the report further, hit "INSERT", goto Statistics tab, scroll down to "Hands", highlight it and hit OK. " #Hands# " should be inserted into the filter expression box. Now hit insert again, this time the Operators tab, Select "> Greater then", hit ok. Finally add "500" ending up with a filter expression
#Hands#>500
You have to hit Save aswell to add the filter.
As for the HUD, theoretically it is possible, but I dont know any method that isn't quite complicated.