Well they’re really the same thing. We have many customers who use HelpSpot for these type of change requests. It’s really a matter of categorization. Once categorized you can slice and dice (filter) within HelpSpot as needed.
The first thing to do would be to setup categories for each type of request. You could then set the option to show those categories on the request form.
Some more advanced options include:
Setting up an email box for each type of request and use HelpSpots ability to auto-assign all requests from a mailbox to a category.
Create your own web forms for each type of request and have them generate emails when submitted. Send the emails into HelpSpot and use the email parser to send them to the correct categories. More details in the link.