I'm not sure your image accurately shows what it is you want (only one of the stocks would get a bonus) but I agree with the premise of the idea (being able to stack selected stocks that are related).
Some of the bonus stocks I bought are above the current market value and since I am gaining the bonus from these already I wouldn't want the price of those to effect the price of the same type of share. For example if I bought several shares at a much lower price and wanted to stack those cheaper shares to sell and to tidy up my portfolio.
It is one of the main reasons I do not trade much in the stock market.
Rated up, though I'm sure someone has suggested something similar before.