Is it possible to have a running total in Configurable List widget as items are entered in?

Also, is it possible to have a running total as items are entered in?

Unfortunately no, it would not be possible to capture the total in such way. The reason why it can not be done is because the configurable list is a very complex widget as it is.

Its purpose is to capture the data in a complex - table like form, while for calculations you should be using the regular fields instead.