In my vacation I did some hacking on Count 2.6. The most significant addition is the database support.
GNU gdbm and ndbm.
Please use Berkeley db for reliability and robustness. The counter and all its utilities employs same locking mechanism. Yes I was able to compile it on NT too. If database support is ON, df parameter is ignored. Please look at the 'Data Storing Algorithm' in the Count 2.6 web page.