Keyboard Shortcut For "Delay"

I'm currently building a web application which does task management.

A very common function is to "delay" the current task, which means it will be postponed until some point in the future. There's already a link to click to delay it with the mouse, however I would like to make sure this can be done with the keyboard as well, for power users like me.

I do this extremely often, so I didn't want to use a slower key combination like Ctrl + D (not to mention that's already used for bookmarking). I really was hoping for a single key solution.

The function keys tend to have purposes already in the browser, and on laptops like mine and some others you have to enter a Fn+ combination to actually use them.

I didn't want to use any of the letters because it's quite common to have a text field selected, and you would end up typing in that field instead.

Temporarily I'm using the "delete" key, however even though that has the same first 3 letters, I think it's a bad idea. I've already accidentally deleted emails a few times by having the wrong screen selected. (Thankfully there is a trash bin.) I'm sure that once the app becomes public this is bound to cause immense frustration.

So my question, is there any standard set currently for what key could be used to delay, postpone, snooze, etc...? Do any other programs that you know of have a similar function?

What key would you recommend as the most intuitive to be used for this function?