Email Frequency and Variable

The product is good and user-friendly. I have been using it for the past 10–15 days. I wanted to check if we can introduce a feature to set the frequency of email sends per hour, similar to how it works in GMass. Additionally, can we add more variables to enable highly customized email templates?
Could you also please share the daily email sending limits and the monthly data management limits? I would like to understand these constraints better.