I found the list of things your HQ gets:
General Store-- Your HQ has no item shop or armor shop. Instead, the general store would sell anything you have seen at other shops you have visited.
Blacksmith-- Not only does the blacksmith sharpen your weapon, they can also add up to 20 rune fragments from each element onto your weapon. Adrienne is also able to make armor (metallic) if you give her the right materials.
Appraiser-- Nabokov appraises unidentified items. Exactly the same as previous suikodens.
Rune Shop-- Jeane attaches, removes, or sells you runes. No new features.
Tailor-- Phil will make armor (clothing) depending on the type of material you have.
Accessories Shop-- Lilin will make accessories depending on the materials you bring to her.
Ship Builder-- By brining new sail canvas and "Ocean Rune Fragments," Tov can modify any of your ship's stats.
Mushroom Growing-- Mao can grow MP healing mushrooms in the "cultivation room."
Mint Growing-- Nao can grow MP healing mints in the "cultivation room."
Bun Shop-- Kevin and Pam sells HP and status effecting buns. New menus are added by giving them additional food items.
Cafeteria-- Funghi sells HP and status effecting food items.
Raffle Shop-- Ban will let you spin the raffle wheel if you give him a raffle ticket.
Confession Room-- Keane interrogates a random member with a number of questions. After hearing what they say, you can either punish them of forgive them.
Training Room-- Reinholt will make your team fight against random members of your army. After defeating five teams, you get a prize.
Newspaper Stand-- Perot publishes a paper every so often.
Saloon-- Louise runs a saloon where you can rest, save, or change members of your party.
Roster-- Desmond stands in front of the roster board, which is a wooden board with brass name plates for each star. You can also change party members here.
Strategy Lesson-- Elenor will let you practice naval battle. You get to choose from five levels.
http://www.suikosource.com/phpBB2/viewtopic.php?t=1038