Suggestion: Multiple Choices + Discard All

I haven't seen any topic regarding this matter, so I'm sorry if anyone already posted something similar and I didn't notice.

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I suggest adding the possibility of picking multiple items to buy, sell (during NPC transactions) or drop all at once.

Example: buying 3 items (such as 10x G1 dark matter, 10x G2, 10x G3, etc) at the same time instead of having to buy one by one;
Example 2: discarding A, B, C and Z item at the same time.

...and also the "Discard All" command for Loot, that would literally discard ALL current items on your Loot list.

PS: With a confirm (typical "Are you sure?") question after both situations, so people don't accidentally sell/drop wrong stuff because of lag issues or something.