I'm working on making Lemmix players based off the CustLemm source for all the official games (including Extra), so that they too can benefit from any updates made to CustLemmix. One such example would be that in the next update, I plan to include the save image snapshot feature that was also recently added to NeoLemmix.
I don't plan to include LPDOS and LPII in this, partly because (especially LPII) the extra mechanics differences would overcomplicate this.
To do:
Original LemmingsOh No! More Lemmings!Xmas Lemmings 91/92Holiday Lemmings 94Covox LemmingsPrima Publishing LemmingsExtra
All done with adding them. Need to do more testing, as well as testing Cust and Flexi to make sure anything I've done hasn't broken them. If all goes well, then updated versions of all of the above will be available at the same time as the next CustLemmix update.
Aside from this meaning I was able to add in Ohayo Lemming San to Extra, there's already one immediately-visible benefit - correct object colors in Other 9 (or well, Other 10 now), as CustLemmix has supported mixing of standard and Xmas styles for a long time now.
EDIT: Seems that everything works fine - ran into one minor snag on Flexi, but that's it, and it was very easy to fix. Now I can get on to adding the new features for the next update, which unless there's anything else anyone would specifically like to see in CustLemmix (note: don't ask for any gameplay changes, including gimmick support (even those that were in LPII), it won't happen as that destroys the whole point of having a Traditional version - however things that don't directly impact gameplay, examples of which would be the image saving, or checking correct levels of replays (NeoLemmix has this, I could look into implementing it here if there was enough interest)), is pretty much just the image saving.