Ok, it's just two subjects in one post and not any specific relation between them

Clickboxer:
Reading the wiki, I found that the information on how to "install/launch" it to be at least for me not enough. Ok, I've created that xml file but:

Where do I type those commands? Within wow?
Is there a user friendly interface for customisation?
Does it loads when I launch a profile in IS?

I'm sorry, it may be obvious to many but it isn't to me.

Another thing is related to ISBoxer, with the steps you can add to a specific bind, it can actually replace the "mother" /click macro, isn't it?
If I'm correct, is there any way to do the following (which isn't possible with the "native" /click) on ONE spammable key?

STEP1: (obvious)
Racial
trinket 1
trinket 2
Gloves
... whatever out of GCD

STEP2: (obvious - example for shaman elem)
Flame shock
Lava Burst

STEP3: (not obvious)
ELEMENTAL MASTERY
LB or CL or whatever....

Goal is to trigger EM on another spell and not on LvB by pressing the same key.

Thank you in advance.