Round to the nearest .5 Blind when using Bet Multipliers

I would love to have the ability to round to the nearest .5 Blind when using the bet multipliers. For example,

- CO opens to 2.2 and I 3b 3x. Rather than having the bet be 6.6, it could be 6.5 or 7.

I am happy to provide more clarification/examples if needed. Thank you!