There should be another way to move items around in your inventory. Honestly, good idea...

A lot of times my mouse loves to double left-click cause it's ancient. So there should be another way to move items in your inventory other than having to click and drag.

This method also enables summoners to move items around while shopping.

Maybe add a command like;

***WHILE SHIFT IS HELD - Press 1, then press 2. ***

This swaps Item 1, with Item 2. And if they let go of the Shift key before they press 2, it cancels the command.

This avoids the trouble of left clicking your Zhonyas after you buy it and accidentally using it when you need it in a few seconds. I can't count how many times I've done this.