Oh I got you.
<Dont worry is not my english first language either hehe

>
Yeah that's how my macros work.
If I press the BuildStairs macro (let's say is assigned to middle wheel button) what happens is:
game will do the following automatically: open the build mode, go to stairs... selected and macro finish here. From now on... you can:
a) press build button to create a stair, or press and hold build button to keep building more stairs (Turbo Build option must be enabled)...
b) you stay on "stairs selected", meaning if you press back item button (left per example) you can build a floor, if you hold down the build button... it keeps building floors.
To stop building you have to press build button to get back to your primary weapon.
This is kind of semi automatic macro, the only thing that does for you is, enable build mode and select a specific piece, then it depends on you what you want to do.