Setting Gecko current

Hello list,
This is my second attempt to post this question. I apologize if it
somehow gets duplicated by Yahoo.

Can the current sense resistor on a Gecko drive be set for an
unidentified stepper motor by the operating temperature of the motor?

In heavy use, do stepper motors get too hot to touch?

I am just finishing my CNC router using surplus parts, and I do not
want to underdrive an axis.

Many thanks in advance for your advice. This is a great list for
learning.

Best to all,
John Champlain