There r more serious issues beside u mentioned mate. Here r few of them
- using 3rd party app for spamming a.k.a mouse recorder or tap recorder
- PC ( chrome users) can change sides without being out of arena. I.e open new tab
- PC users r on top against android and iOS users just because they r just a button away for 5th skill, swap inventory.

Sts has to address these serious issues.