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https://tex.stackexchange.com/questions/262746/replace-regular-parenthesis-with-stretching-versions

Warning: The following answer will not help you achieve your stated goal. Instead, it is meant to convince you to abandon your plan, by showing that using \left( and right) everywhere in math mode is bound to produce poor typographic results.

Про пакет не знаю, но, думаю, можно просто по регулярке заменить.

Yorween ()

А по существу можно так:

{
\let\leftparen=(
\let\rightparen=)
\catcode`\(=\active
\catcode`\)=\active
\gdef({\left\leftparen}
\gdef){\right\rightparen}
}
\mathcode`\(="8000
\mathcode`\)="8000

но результат, скорее всего, не понравится.

TeopeTuK ★★★ ()