@Azmuth Divarchchron: like the basic premise BUT would suggest some option other than colour to distinguish between the two.
How about small rings instead of solid dots for the secondary weapon aim points? (
along the lines of something nearly suggested by @Sylow)
My problem with the colour aspect is due consideration for those with colour blindness (
not a condition I suffer from personally but I know people who do).
The colour option would not be so bad if FD also make the colouring of HUD elements more configurable by the end users.