Left click macro doesnt work as intended

I do not know if dev knows how left click works, but currently if u save a left click macro it will be consisted of "Left click down" follow by a "Left click up" and if u bind this to ur left click, it can either only play once, or toggle etc, the usual option. But how left click work is... U click u hold = left click down, u release = left click up..

I want to make a macro that will not affect left click but add onto left click.

So..

When I hold left click, macro plays..
Left click down.... (Only left click up when I release left click) + mb4 down, 0.01ms mb4 up.

Have anyone figure out about doing this yet? Or still not possible like lets say even in 20 years? Cause I believe this is a very common topic as I've google it and almost everything leads to no avail..