Commands:
/char [num] - Changes your character so you can have multiple characters (like in an mmo)

/giveGold [targetName] [amount] - Gives [amount] gold to [targetName]

/help - What do you think this does?

/pvp [on/off] - Toggles PVP. /pvp on turns it on.

/quest - Shows your active quest

/removeArmor
/removePack

/setRegion [parameter] (admin only)
/stats - Shows your character stats

Shop:
Use shops brick to access the shops.
You can change your class and buy weapons and stuff.

Adding bots:
Just use a regular bot and in the events,
on-bot-spawn, bot, changedatablock, [monstername]
It'll retain the bot appearance but have a different playertype

Events:
Use RPG_modVariable to change variables such as gold, exp, etc.
You should be able to add/subtract and what not.

Quests:
Done through a combination of code and events, just look in the code to figure it out.
You don't have to use quests via the mod if you don't want to, as you can add EXP via events and what not.