Custom fixed RPM — the Fixed menu adds “Custom RPM…”, with a slider for quick changes and a field for an exact value (e.g. 3000 RPM). The allowed range comes from this Mac’s fan hardware limits and is always shown; values outside it can’t be applied. The last custom value is listed in the menu, and presets outside the hardware range are hidden (#26)
Adjustable high-temperature alert — Settings → Notifications adds “Alert temperature”, configurable from 60–105°C (default 90°C). The row is collapsed by default and expands to a slider when clicked; the value applies when you release the slider, so dragging never triggers a stray notification
Improvements
Much lower background resource use — fan animations fully pause while the menu bar panel is closed; the spinning menu bar icon only redraws when its image actually changes; system service status is no longer queried every 2 seconds; and the SSD temperature sensors are reused after the first discovery. In local measurement, CPU use with the panel closed dropped from about 20% to about 3% (with the spinning icon turned off) (#26)
A tighter menu bar item — when showing temperature or fan speed, the item’s width is sized to the actual reading, removing the extra space around the icon and text