power output

could a second window but put under the existing instant power output so that the second window would show average power output being put out during the ride so that when you are doing a ftp test you would feel motivated at seeing the average go up when you increase power as the test goes along.also on longer rides it would be good so that the average output could be controlled 

I believe your request has more or less been suggest a few times (average power, average HR, average speed and so on) so please vote up the existing requests so Zwift knows what users want.

Averages are not a good way to judge fitness. There are too many ways to hit averages to make them useful.