The main principle and prerequisite for complying with the increased data protection requirements is that the amount of data is minimized, i.e., limited to what is necessary for the purposes of processing. Even if it is convenient and tempting to capture personal properties as free text, you must always ensure that you can track this data and remain in control of it.
Tip: When customizing, make sure that only the personal data fields and objects that you can also monitor are adjusted. The result of the extensions you request may be that this data has to then also be additionally protected, and additional information concerning it needs to be provided (extended rights of the data subjects).
It cannot be avoided that the customization effort increases if information reports and data protection convenience features are adjusted to the changed or additional objects that represent personal data.