I have a few suggestions for some added features for the following tweaks if possible.
Magic Mirror Hotkey: Give an option to make the hotkey'd warp not instantaneous and imitate the standard use of the item by disabling weapon use.
Reason: The delay is there to give a window in which warping out of danger with it still holds a risk and leaves you defenseless by preventing you from attacking back conventionally. Removing the window of delay makes the item a get out of jail free card in any scenario thrown at it, which is extremely exploitable, and implementing the delay without disabling their weapons still makes the item much safer than intended.
...... you do know all the other things TT2 can do, right? Dude, this is way at the bottom of the list of things that is exploitable, Even just in the vanilla game there are a bunch of exploits bigger than this.