The user should be able to select only one checkbox from all other checkboxes added on a document

Seriously, this is a needed feature!

Please add the ability to have radio buttons NOT preselected and make them required.
Clients are not aware they can change the options when executing a proposal.. leaving money on the table.

So a client is forced to choose either 'yes' or 'no' or either 'apply' or 'waive'.

Optional items should be allowed to be a part of an exclusive group. Ex. if customer chooses option A, options B and C cannot be chosen or become unchecked

Allow to group checkboxes and provide 1 of X option, similar to dropdown field

This is super simple. Simply ad a group option to the checkbox field so that you can group multiple checkboxes and require one. We NEED this.

add checkboxes with 1 out of X options as required

Check box field : conditions where recipient can choose and check just 1 from all assigned check boxes

Ability to have check boxes checked in order while you click through. Also be able to have a group of check boxes grouped together and then having the option to select 1 or many boxes depending on the area.

An ability to just one field become required out of two - chosen by the recipient, e.g. there are two fields for the signer and he is choosing in which one of them he'll be entering the data in and therefore field will become required

Multiple choice for checkboxes (like radio button in a section in the pricing table)

Would like the ability to have optional check box fields without having a selected dropdown field that wouldn't translate to a government document that might need to be printed out and that allows the customer to fill out manually.