ok like in DBZ .. ever seen a KI trading guy who has turned on his turbo ??? just change the keybind then it's exactly as you which
bind "e" "+powerup" --> bind "e" "+powerup;turbo"
you can turn on turbo during charging KI (called powerup) ... so bind this line and you're everytimes in turbo during powerup (and after it)
but it's still "realistic" ... imagine when Goku used Kaioken against Frieza (Kaionen = strong turbo) ... every hit from Frieza the Kaioken was off ... the team only made it as it is in DBZ ... and I think it's ok so
(can you concentrade, when I kick your *** ???)