I committed doetbx_ff2n.sci and doetbx_fullfact.sci, along with demos, unit tests and help pages.
I also worked with tic-toc, benchfun and profile functions to test the above functions.
The results are on the main page of the DOE wiki.
In the binary versions of Scilab-master-1340229477 and Scilab-5.4-alpha, plot() command outputs fatal error in console, along with a bug message.
If I plot again, then Scilab closes.
I filed a bug in Bugzilla Bug 11368.