Mids and enhancement boosters
Use the + and - keys while in the enhancement selection pop up.
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There is. When selecting the io to slot into the power in the enhancement selection screen, hover over the io in question, and I believe use the + or - Keys to adjust.
Awesome thanks guys never would have figured that out.
I'm sure that was embedded in the patch notes for a mid's update forever ago, but I'm terrible at reading those. Glad someone else does...I would've never thought of it, LOL.
Now to redo like 500 builds >.<

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You can also set every enhancement in the build to the same value by choosing Slots -> Relative Level -> +5 (or whatever you prefer). I'm not at a computer with Midz' at the moment, so I may not have the exact menu names, but it's close enough that you should be able to find it.
If you choose a value that's invalid for some enhancements, those enhancements will be set as close to that value as possible. If you try to +5 your build, SOs and HOs will cap at +3. Likewise, if you set your build to -3, IOs will floor at +0.
Last I checked, Mids' will let you add boosters to any IO. In game, you can only boost IOs that enhance the power that they're in. Procs and IOs that have special abilities (Like a Numina +Regen/+Recovery or a Karma -KB) cannot be boosted, and IOs that have an enhancement and a special effect (Steadfast Res/Def, LotG Defense/Global Recharge) will only have the enhancement portion boosted.
Finally, remember that Mids' doesn't know the difference between IO sets and Store-Bought sets, and any store-Bought Enhancements you have can't be boosted (this includes ATOs, though I don't think Mids' allows you to boost those).
@Roderick
Just curious if it's possible to boost IOs in mids and if so how?
Thanks!