Need to turn off add-a-block previews – flashing causes headaches!

For accessibility, you absolutely must add the option to turn off add-a-block previews on hover, and/or make the preview only appear after your cursor sits on a block option for at least 0.5 seconds. (Preferably add both.) Moving my cursor from one block to the other makes the preview image flash in and out, and it’s causing eye strain and giving me headaches/nausea, which makes it totally unusable. I’m switching to the classic editor until this is fixed.