Basically

Just the ability to put a limit on how much energy other users can use on heats you purchase.

For example, if I have 100% energy but I purchased a heat and I have other things to use my energy on, I could place this metaphorical "Cap" at 50%, so if my energy was below 50% the user couldn't keep trying on the heat until my energy made it over 50% again.

This would just be a nice feature to allow you to stop and send chasteberries if you wanted as well, so they dont rapid accept and kill your energy on a lioness who you'd like to chaste/Black Stallion.

Giving your energy to other users is a bit risky so it'd be nice to be able to stop them from using too much so quickly.

Let me know if you have any additions to this idea or variations, I might edit them in!


Edit:
Into the future a bit, I still believe this feature would be useful. Allowing users to control your energy is a BIG DEAL! Too many times I've sent a request to a 1% fertility lioness and the owner began to spam click accept, blowing half or all of my energy before I could send chasteberries or message them to stop. It happens a lot.