7th edition Trying the HL Demo - A few questions

[tsnouffer]

I run a World War Cthulhu campaign and am interested in some character management and help with running combats. HL seems to support both in 7e so I am trying the demo.

However, it is unclear to me if HL is customizable enough to incorporate the WWC material especially the extra, setting-specific skills.

My question to existing users:

1) Do you find HL helpful for character (PCs, and NPCs) management?
2) Have you used some of the Game Master tools and how do you like them?
3) Do you have a sense on how customizable HL is for a setting like WWC?

Thanks!