No idea, I don't autoclick to cheat, I autoclick to avoid breaking my mouse, so I only do it when at my keyboard, and the click rate is (I believe) within human limits. (think it's 25 clicks per second?) Albeit high human limits.

As for the displayed multiplier, at least one of the decorations also gives a multiplier, which gets factored in. Mine is in the 30's.

(fwiw, I'm at company lvl 15. 4900 shares to next level, 21.57 shares to 11th decoration. (have 8k). Still don't have the decoration that increases shares.)