There is no real tool to count the lines. What I do is put all the lines into an excel spreadsheet separated by scenario like mangagamer does. Then I use a formula that adds the lines from each scenario minus the headers to get the count.
Looseboy (Wrote G-Senjou and Sharin) has Boku no Hitori Sensou coming February 27 next year. I hope that it will be as interesting of a readd as the others were.
And this is what happens when your translator is indecisive, I had everything extracted though I am glad to have seen that it has been picked up. Hopefully the August-soft curse doesn't happen and it doesn't get dropped. Good Luck.