I want to be able to assign X of my purchased tokens to spend for a specific model in the future, without spending it directly. This makes it easier to plan ahead:

Usually I look at several tip menus, make a mental note what I would like to see and how much it costs. Then I see if I have enough tokens or purchase more, etc.

The proposed change is: I get an additional button "reserve tokens" for each model. Assume I have 2000 tokens, now I open the tip men, see something that I like for 150 tokens. Then I would reserve 150 tokens for this model with the button. This would not transfer the tokens to the model right away, but hide them from my tokens. My token counter would then display 1850 tokens, and there would be a "reserved tokens" counter in the model chatroom.
Additionally, I would like to have an option to restrict spending tokens to the reserved amount. So, if I have 150 reserved tokens and I want to spend 180 on the model I have to confirm this first (if the option is active).
Finally, there would be an overview of reserved tokens, so that you can retrieve them again if you change your mind.

This may be detrimental to the site, though? If users can budget the amount of tokens that they can spend they might likely spend less. In my case it would rather lead to the case where I buy more tokens at once and budget them carefully. So essentially, xhamster would have the benefit immediately, but I may forget about actually spending these tokens on the models.