Request: ability to use custom email template

Hi
many time when I build forms I use conditional logic to show/hide fileds and I stylize the notification email with HTML/CSS/Datafields but this creates a problem with empty rows in email message, which my clients don't like or it confuses them.

Using [All Fields] fixed that problem but I don't like how email message looks and some other forum member also agree with this.

So my request/suggestion is to give us the option to use custom email template and it can work something like this:
1. In form settings there could be an option to choose between default and custom template
2. You define how custom template need to be named, for example custom-field-email-pattern.php
3. We copy the file and rename it to that name so that we change the CSS style without worrying that it will be overwritten each update

Is this achievable?

Another request, is it possible to "transfer" the inline CSS styling from .php file somewhere inside the form options where we could define margin and width?

Kind regards