Here is the list of keys to note when using the Vector Edit Tool or the On Screen Digitizing Tool.

A key

Convert the selected vector to an arc.

B key

Convert the selected vector to a bezier curve.

C key

Create an arc using a midpoint on the arc and an endpoint.

E key

Change the start/end point of the current loop.

F key

Bezier curve fit

G key

Toggle a corner.

H key

Guideline cleanup

I key

This key breaks the current vector into two parts at the cursor.

J key

Join start/end

K key

Sharpen corner.

L key

Turn the selected vector into a line.

M key

Mainly for neon and LED signs, this moves the opening of an open path to the current cursor.

N key

This key starts a new path at the cursor.

O key

This key breaks the loop open at the cursor.

Q key

This key starts the start of a bezier curve fit operation.

S key

This key starts the process of digiziting a bezier curve.

T key

This key creates a new arc that is tangent to the last selected vector.

Del

This key deletes the selected vectors(s).

Ins

This key does the same thing as the I key, above.

W key

This key adds a simple line to the current loop.

X key

This key closes the current loop.

Z key

This key executes the Edit | Undo command, the same as Ctrl+Z.