I don't know specifically, but suggest using a fixed resistor
for the 10A (presuming you only care about ILOAD at one
voltage of interest) and use the E-load for a 0-5A step.
If you can't find a field for "DC current" or some such.
The E-loads I've seen, have a fairly leisurely edge rate.
I've built little load pulser jigs in this range with a bank of
little power MOSFETs and drain resistors and 74HC14s to
drive them. That's a bit on the too-abrupt side; gate
resistors might be wanted to mellow it out.