Rating values are stored in the tracks_persistent database table provided by LMS. Internal rating values in LMS can range from 0 (no stars) to 100 (5 stars) where 20 equals 1 star (40 = 2 stars, 50 = 2.5 stars etc.). So how rating values are stored in LMS is a default that cannot be changed.
Ratings Light will always display the exact half-star value on a 5-star rating scale (e.g. LMS track rating value of 50 is displayed as 2.5 stars). You can enable or disable setting half-star ratings on this page: LMS settings > Advanced > Ratings Lights > Menus.
If, for some reason, you have tracks with odd track rating values (e.g. 67), Ratings Light will round them to the nearest half-star rating - for display only, the actual rating values remain unchanged.
“Album ratings“ as such do not exist in LMS, only track ratings. You can set a rating for all or only the unrated tracks in an album using the album context menu. Setting ratings for single album tracks in this menu is possible with the Default, Dark Default and Classic web skin.
RL does not display “album ratings“, i.e. the average track rating of all album tracks. Most albums would probably have a very low average track rating (displayed as zero stars) and you'd have to display the “album rating“ in the album context menu.
If you want albums sorted by (average) rating, take a look at the Context Stats plugin.
“Album ratings“ as such do not exist in LMS, only track ratings. You can set a rating for all or only the unrated tracks in an album using the album context menu. Setting ratings for single album tracks in this menu is possible with the Default, Dark Default and Classic web skin.
RL does not display “album ratings“, i.e. the average track rating of all album tracks. Most albums would probably have a very low average track rating (displayed as zero stars) and you'd have to display the “album rating“ in the album context menu.
If you want albums sorted by (average) rating, take a look at the Context Stats plugin.
It should work with online tracks that have been added to your LMS library as part of an album. LMS does not import single online tracks or tracks of online playlists as library tracks and therefore they cannot be processed by Ratings Light. That's a restriction imposed by LMS.
No. Please use the Alternative Play Count plugin for that. It can auto-rate tracks and offers you an alternative, the dynamic played/skipped value that reflects your recent listening habits/decisions but does not mess with your tracking ratings.
You don't have to. Since ratings are stored in an LMS database (see FAQ above), you just uninstall TrackStat and install Ratings Light. TrackStat had its own database table (with identical columns though) but ratings should be in sync. You can even import ratings for local tracks from old TrackStat backup files.