Even in a light twin increasing IAS could put you close to gear and flap limits?
You actually decrease the IAS, to hold a fixed GS, on a descent into any wind shear.
So the danger is getting too slow, not too fast.
An Airbus has a “GS hold” mode. I don’t know what it’s used for, however.
AeroPlus wrote:
Most instructors and examiners don’t like people asking too many questions.
Because they don’t know the answers themselves…
Most instructors recognise that we’re talking about NPAs and a 100ft discrepancy on approach isn’t going to make much difference with a 350ft MDH. 
As Josh says, half estimated GS + a zero; the maths is easier. From there onwards range vs. altitude +/- 100ft at each range check is more than adequate.
An Airbus has a “GS hold” mode. I don’t know what it’s used for, however.
I think you mean the GS mini Function :
