I'll be very pleased to meet you on the Normandy Battlefield.
I'm ready for the long run (750 turns), I don't know what is the Volcano option, so if you may help me (I'm also a recruit), I can answer your question about the playing mode.
Welcome to the Blitz, we will try to help you out to get started. ;)
The "Volcano option" that you refer to are scenarios created by one of our Blitz members Volcano Man, he has created versions of (almost) all the HPS scenarios which can be identified by the tag _Alt
on the end of the scenario file, his scenario packs also contain excellent art packs to enhance the existing HPS artwork.
If you wish to download his _ALT scenario/Artpacks here is the link to his site...VMods site
Hope that helps.......:)