Morten Blaabjerg
Settler
All techs a tribe has can be traded. However, as far as I know, techs with the no,no prerequisites and the ones derived from, will have no effect on the tribe gaining them. It will still be as if they didn't get the techs. So only the tribe which has been given the derived techs before they were derived from the no,no tech will be able to research the techs following from this tech. I'm no expert on this. For more detailed tips, see Blackloves tech tree design tips part 1 + 2 in the scenario league design tips.
http://apolyton.net/sleague/Guides/tips_main.shtml
http://apolyton.net/sleague/Guides/tips_main.shtml