Zanzi, FYI: "/attack [number]" is depreciated since a while ago, use "/attack bloody".
On topic, most of my shortcuts are related to dev commands; but here are a few other standard ones that I use, might be useful to someone:
/target next item
/target next player
/target next npc
/target clear
/pickup
View description:
/targetinfo
Bring up right click menu of current target, helps if the target is obscured:
/targetcontext
/show guild
/show quest
/quit now
Save typing the boilerplate to npcs:
/tellnpc Can I help you?
/tellnpc Tell me about you
/tellnpc How are you?