Item binding defaults

I have an idea for item binding defaults. Please add a few thoughts on potential issues.

I often find myself in the situation where i've raced back to shop, bought items and charged straight back out to the field to save a tower or teammate. In that process, I forget to move my items around to where I expect them to be. I always put health potions on slot 2, Sightstone is always 3, pink wards are always 5, my main active item is always 1 (FQC, Coin, ZZ'rot, Locket etc.).

So my idea is to set default bindings to particular items, so that when you purchase a particular item, it always falls into default key binding. Regardless of purchase order, if I buy health pots, my items are automatically reorganised so they are on key 2. I could see this being part of the custom item pages setup. Some issues might arise, for example, if I have purchased FQC and Locket and my default is to have them both to key 1. I guess the system would simple choose one and put the other in an empty slot, as long as it was consistent eg. by purchase order, it wouldn't be too much of a hassle. I would expect the player would maintain the option to move items around in game to override the defaults.

As an aside to this, why is trinket always 4? Why don't we have the option of moving it around?

Thoughts? I appreciate the feedback.