Home plate for me has probably the highest concentration of student pilots in Maine. Actually, no probably about it. Never felt comfortable LUAW there and by extension anywhere for previously stated reasons and having seen students do some very random, scary stuff. Most can be attributed to learning mistakes, but if it is serious I always politely mention it on the radio and point it out to their instructor after.
i wouldn’t get my knickers in a knot if someone started rolling before I actually fully crossed the hold short and called it. However, if I just heard my tires chirp and they rolled…. Yeah, we gonna share a four letter(s) word!