stopwastingmy time,readers time and maybeyours.
"All shapes that have a corner have a little control. Slide the control to round that corner, individually or together."
with path tool and alt pressed over that corner you have that control, but that will deform not only one side but booth, in corel it is direct
If I go deep on that, illustrator don't give you option to round a specific corner on a rectangle, only all of them, you must make new points, delete old one and curve shape between.
In corel you can make whatever you want, fillet, chamfer or scallop directly for every point you select on EVERY shape not only rectangles.
"Assign the key command as an action, then perform the action via key command. Trim, Align, etc."
fact remains, you can't have a direct shortcut for trim, intersect or else, yes, you can make a new action, record it and asign a combination from F1 to F9 with shift or ctrl. I don't want F1 to F9 nor alt or control, simple as that, in corel I can assign everything on everything, in illustrator only what they give you in edit, keyboard shortcuts.
"It only works on Rectangles actually, but you can see the angle of rotation in the Transform palette and change the angle there as well."
No again, you are in deep error, you read from books not from screen, you talk like the cheapest employee that adobe can have, there's no way to read an object angle after you insert it in transform tool and press enter, it will be rotated but if you forget that number you can't rotate another object with the same amount because you don't know it.
"The Ruler tools shows you the angle object."
at least you saidsomethingpartiallyright, his name is measure tool not ruler.
"Easy now. I'm obligated to instruct you in anything,"
You are not, in fact you more confuse people.