Bradfordart: these shortcuts from your notes seem all over the keyboard. is it possible to fully customize them in XSI? as for the original question about extrudes - my softimage knowledge is a little rusty but have you made sure that you are in local transform mode before invoking the extrude tool?
Yeah I almost never use the regular extrude command. Ctrl+d and just use the move manipulator in local mode. Ctrl+d also happens to double as a bevel tool depending on what element type you have selected. If you really want to get fancy with picking a normal that isn't averaged from your selection use ref mode. Right click…
I've switched almost completely to XSI. I've got some notes here I made when I began to learn it; it might be useful. http://www.jamesbradford.net/wip/xsi_notes.txt
'm' key and ctrl+d whore here too. such a shame that highlighted components don't count as valid selections though (for duplication). when in tweak mode i find it easier to middle click a reference vec (near enough is usually good enough).