Thanks Paul, it definitely looks like a good find. I haven't, however, been able to effect any changes using actions.xts. I have tried removing entire sections (for instance, the copy, move, delete actions), adjusting if statements, and even removing the file completely, but haven't seen any changes to the Actions page.
I did notice that actions.xts does not appear to have access to the "ui_black_list" variable we were able to use in presentation.xsl, so perhaps that needs to be ported over or there may be a different angle of attack possible. "ui_black_list" is defined in \templates\ps\logicsheets\presentation\main\framework.xsl.
I have been editing the file and then restarting the Cognos service via Windows service utility, if that might make any difference. Should I need to rebuild the ear or something special?