These new power drain "feature" is stupid, useless and it makes the mod less enjoyable:(.
I dont know a mod where these stuff is used, than why must Discovery implement it? Couse its more realistic? Then redone the whole FL universe, couse there is no cubic meter in the space that is realistic in Sirius...
The only positive about these drain can be if the energy comes back immediately or after 1-2 seconds after leaving the cruise speed, but the best solution is to remove these feature.