First Layer small curve speed limiter

[Conundrum68]

I notice that when I have a hole, slot, or other internal curved geometry below maybe 1/2"Dia, the material tends to not stick around that hole, bunch up on the extruder and generally screw up the first layer completely.
If I slow the first layer down to around 25% or less, this problem goes away, but then the whole first layer takes forever.
It would be great to be able to choose to slow down first layer curves below a chosen radius to a certain value.