Sorry guys, but currently it works for me - with current Gutsy and compiz desktop effects enabled, when I right click the workspace switcher and choose preferences I get a dialog that lets me change the number of columns and rows in my workspaces setup - and it works (at least the columns, I haven't tested more then one row - I don't like that).
At the time when that didn't work, I simply turned off desktop effects, used the workspace dialog to change the number of workspaces and turned desktop effects back on - and that kept the same number of workspaces that was set in the workspaces preference dialog when desktop effects was disabled.
Sorry guys, but currently it works for me - with current Gutsy and compiz desktop effects enabled, when I right click the workspace switcher and choose preferences I get a dialog that lets me change the number of columns and rows in my workspaces setup - and it works (at least the columns, I haven't tested more then one row - I don't like that).
At the time when that didn't work, I simply turned off desktop effects, used the workspace dialog to change the number of workspaces and turned desktop effects back on - and that kept the same number of workspaces that was set in the workspaces preference dialog when desktop effects was disabled.