default is 512 bytes, how do i change size?

Do you mean the file alignment? The section size for PE gui files is 4kB by default.

There is no assembly time setting for it, but you can modify the formats.inc file to do what you need.

But maybe "format PE native" will do what you want?

pe native? looks nice
but thres no info in manual about that =/

PE native is the Windows driver file format. I have not tried with a normal non-driver exe, so perhaps it won't work (try it and let us know). But basically it means this: all file-offsets = all RVAs = all section-offsets with a basic alignment of 0x20.

Oh yeah, I almost forgot, I posted here to create the PE format manually.