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If its your server / VPS it shouldnt be an issue. We dont have any issue setting rDNS.
But I doubt (m)any hosts would set rDNS if you were on shared hosting, even if you bought an IP just for your site.
While you can have multiple A and PTR records for an IP it won't have any impact, as most applications, such as email, use the primary IP on the server for sending mail.
As the guys have already said, on shared servers the Mail almost always gets sent out on the main ip. If you really need your own RDNS then look for a cheap VPS/Dedicated box!