[Scripting Question] Advanced/More weather types

So i've been wanting to improve how rain and other effects look and add new ones for like leaves blowing in the wind etc.

now, i have little scripting knowledge so probably why i sucked at this.

So, i looked around and around and found the rpg maker MAW 1.2 script (basically an improved weather system)
it can run itslef well on teh overworld thats fine just... any weather even no weather battles just crash

its got something to do with the prepare___bitmap the ___ being sunny, rain hail sandstorm etc. in battle which aren't in the script.

how could i merge the two together if possible (Either adding the weather to PField_fieldweather or a script section above main)

if anyone can help that'll be helpful just want better looking and more weather ^^