... That's pretty much how it already works though. The Tapastic editorial group creates/adds to their collections with series that have caught people's eyes or just seem like a perfect fit for said collection. I'm assuming they can only make the collections so large before they basically become their own separate pages so that's why they only pick the notable ones from the start. So if you think yours is a good pick, then message one of the staff members and see what they think.
I dunno, maybe this is just me, but I feel like if it became a "people request for series to be added" it would either a.) become a popularity contest, or b.) defeat the purpose of the collections and we'd end up with pages with hundreds of series that may as well just be a browsing section. But that's just me