Hey guys, does anyone know if it is possible to edit the quick menu (spacebar menu),
Or create a custom (keyboard shortcut) menu that has the same functionality, Basically
I just want a menu where I have to hold the key down.
Thanks in advance 
You can build a custom menu with the items you want. If you assign a hotkey to the menu (Ctrl+Alt+click its name) then it will pop up at the cursor. Note that some items in the Tool palette can’t be used in a custom menu.
That’s what I have already done, but I want it to work exactly like the spacebar menu,
where I would have to hold down a hotkey and it stays in place until I release the hotkey.
With your method you click the hotkey and then 9 times out of 10 zbrush dismisses it immediately
because the cursor goes outside of the menu with pen wobble.
Sorry for the confusion.
You can increase the value of the Preferences>Interface>UI>Pulldown Border slider. Be sure to store the configuration (Shift+Ctrl+i).
It’s not possible to do exactly what you want.
Thank you very much, I didn’t know about that