I do agree that previous exhibitations should be repeated, could be called volume two, or II. Pets are constantly being bred and lines constantly improving so it would make sense to do re-runs of exhibitations to showcase the new blood.
As for the other suggestion, I think that it should be subscription features only. The reason? The more premium subscription perks means moreof them will be purchased. The more gold being purchased means the site has more funds to keep alive and improving. What is a couple bucks to us every month adds up to quite a lot for beastkeeper. Also the subscription features makes game play more convenient, like how it allows the sending of all pets of a group to the arena. So your suggestions sound like they would fit perfectly.
The sending a group to training has been suggested. Coding and group size would be the biggest issues with it.
As for the SPSB sending, I can see a lot of accidents happening. What if a pet that wasnt meant to be sent accidently slipped into that group and off it goes, never to return again? I think this should remain how it is, having to go to the pet's page to be able to send it. That way accidents are hardly ever made.
The deleting schemes was also suggested and in several methods. Being able to delete items without having to go to every single item's page is defianatly a good idea as it saves time and frustration. So I support this wherever it is suggested.