there is a way to import the macros but i don't know what is is sorry. What i do is write my macros at work on note pad then when i get home i just cut and paste. and on macros that i use on 4 toons i set them up write the name using keyclone so it goes to all 4 hit enter so it goes to the text part of the macro then hit ctrl+v and then my macro is done x4.

The other part of your question gets a little strange. you can use alt for 1 and ctrl for another but it will all depend on what your trying to do and what classes you are doing it with.

why have it like this:

Mage1
/cast [modifier:alt] fireball
Mage2
/cast [modifier:ctrl] fireball

when you can have it like this:

Mage1 + Mage2
/cast Fire Blast
/cast [modifier:alt] fireball
/cast [modifier:ctrl] Frostbolt

the posibilities are endless, please clarify the question a little more.