If anyone is interested in the SS editor you should know that the Green Man Gaming version of Silent Storm Gold includes it. I do not know if it runs ok on Windows 7 since I am running Windows XP but on my system it runs just fine. Also another funny thing that I noticed since I own the game on GOG and on GMG is that GOG only includes the Silent Storm manual and the GMG only includes the Silent Storm Sentinels manual.

Bump/vote for editor.

Here is a link for the map editor:
http://www.strategycore.co.uk/files/s2-3-mapedit/

If you go to the SS3 forum section, you'll see that BlunterII and Novik65 are pretty active in modding SS3 and they seem to always be looking for feedback on how to improve their mods. I am sure they would welcome any constructive criticism and they are very helpful, in case anyone wants to make their own mods/maps.

Hope this helps.