1) trendline alert showing on multiple charts - QT extended hours setting applied to the symbol, not the specific chart. In MT, it is specific to the chart. That setting impacts the trendline alerts, which is why right now it is tied to one chart. Will see.
2) There are significant issues with doing trendline alerts, or any alerts on Historical charts. They only get updates if you open the chart or explicitly backfill. Last candle is really intraday data. And where intraday charts leave a gap if data is not there for a specific minute, HIstorical charts do not, and that drastically impacts the slope of any line drawn on the chart.
3) Popup notification location - In general, the standard location for these is above the taskbar notification area. I could in theory put them anywhere, but don't want to just allow random location. I could let the user select the monitor they will be shown on. Would that work?