Should League COPY Dota2?

The ping system, OMG yes. Not just the ping map aspects. You can alt click the enemy hero portrait and it notifies that hero is missing, then you can ctrl click to notify hero has returned. You can alt click ur spells and tell your team if its off of CD or how much longer. ALso you can notify when you need x more mana to cast spell.

Additionally you can alt/ctrl click to notify team that you'll be purchasing x item and you need x money to do so. This isn't as important to LoL where items are all pretty generic...but it could be a useful/quick way to tell ur team that you just need a bit more farm to finish an item that will give you a huge power spike.

As for courier + tp scrolls + side/secret shop vs recall + static shop, this maybe too complex and unnecessary of an idea for the LoL bunch. With that said i feel the dota approach does provide more options. Recall is good for pushing out and getting home quick to defend, going home to shop (saving a walking trip home), going home to regen (saving 1 trip home), and on occasions escaping.

The tp scroll takes a slot (user makes a choice for item or tp), tp cost 100gp (choice to get tp or next item), scroll has a minute cd (do you use it to go home, or tp to another lane), ability to tp to any allied structure to help defend or save your carry (forces more team fights), used as an escape (only disable can stop a tp). TP >> recall; more user choice, more features, more team fights, more counter play.

Courier; requires team to buy it (you can choose to buy more than 1 if you need ocnstant ferrying), upgraded it (choice), control is shared with team (choice who gets it), get items and regen in lane (so you dont need to walk/tp home), courier can be killed (traps items on it for 2min and gives team 150gp = counter play). I think the courier adds a lot of strategy to the game and keeps you in the action longer.

Side/secret shops keep you in lane longer without the need to go home to get items. Secret shop mostly forces you to go there to get bigger items complete, forcing you to send courier or walk there yourself, where you can likely get ganked and lose your gold.