xtech, I have no plans to build a custom form builder module for X-Cart. Maybe Qualiteam or someone else can create one for you.
I can build custom forms with database insertion and form data management, on a case-by-case basis. Get in touch for a quote.
If you use the Wordpress addon in reBOOT, there's a
plethora of form builder plugins available. For example,
this form took 5 mins to make, with Ninja Forms.
If you want to DIY, you can use the
Bootstrap form builder and generate PHP code using a tool like
Forms To Go.
I have created custom reBOOT
form addons with AJAX validation and submission, available
here. With basic HTML/JS/PHP skills, they can be extended to your liking.