IDK if anyone else knew this, but apparently, if you hold +use, it makes forceprev/forcenext cycle through your items instead of force. Similarly, if you hold +use, it makes +useforce use your selected item instead of your selected force power.
So, hybrid items/force classes are possible without forcing everyone to bind invprev/invnext/+button2.
I wonder if we would have seen more variety in class loadouts over the years if this were widely known.