For the Non-Encode Catagoryare mathematical operations part of the exempt list like a regular expression or a space? specifically =, +, -, *, /, ^ and % ? (equals, add, subtract, multiply, divide, power, modulus)

say: var %a = %b + %c

For the non-encode catagory, mathematical operators

ARE fine to use

IF they are used for operation purposes:

;; this is fine:
$calc($NativeThing + $NativeThing2)
;;This isn't fine:
$NativeThing(=+=)

Also: what about regsubex with the use of markers, obviously \0 is out of the question because it contains a digit, but does the replacement part also fall into the realm of the exempt list or just the expression itself?

Only the PATTERN portion of a reg/sub/ex is exempt. The replacement text and markers are

NOT exempt and must come from a native source