Yeah, that bothered to me too, but (fortunatelly) remember that you always can change some tools parameters to get that you want easily (at least in this case...) and improve your workflow with a little mend without have to wait for an update...
Open the
lm_reparent_bone.lua tool in a text editor and search for this lines of code:
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g:SetColor(255, 0, 0)
g:SetSmoothing(true)
That define the color,
opacity and smothness of the drawed arrows and you can change them (in example) into something like this to try:
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g:SetColor(255, 0, 255, 192)
g:SetSmoothing(false)
Well, you always can play with them a little to choose the parameters with you are more confortable

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