Write a batch script like so:
@echo off
if (%1 == "") (goto end)
set gofile=%1%
shift
8g %gofile%.go
8l -o %gofile%.exe %gofile%.8
%gofile%.exe
:end
The batch file can be anywhere, but let's say it's in 'C:\one\two\three\GO.bat' sans the quotes. In the SciTE property file change:
command.go.*.go=$(FileName).exe
to
command.go.*.go=C:\one\two\three\GO.bat $(FileName)
And when you hit F5 or click on "Go", it will compile, link, and execute the file.