This mod is designed for slow rate of fire characters like Silver but will work with any character. 

REQUIRES A MOD THAT SHOWS YOUR STATS IN SHOP, ETHER QOL LOCK WITH THE SETTING ON OR
SHOW STATS IN SHOP There is a version with Show Stats in Shop built into it but hidden so that the mod works without the effect of the dependent mod.

(It was ether that or have the player hover over their weapon bar to get weapon details every time they buy a rate of fire item)

This will change your ammo's color based on if you can shoot at the current time or not. 
Green = Good to shoot.
Yellow = Average human reaction time buffer, press when you see it
Red = Can not shoot (or out of ammo)

This mod will grab your bonus temporary rate of fire at all times and update your base rate of fire when you access the shop menu.

NOTE: This mod will need to be updated after any change to Blood Tribute's rate of fire or it will not be correct when Blood Tribute is active.

Won't update unless you open your shop so don't use Quickbuy to get your firerate items
IF YOU SWAP CHARACTERS OPEN YOUR SHOP, this updates the rate of fire.