...and fittingly, nin10doadict has just converted his pack CasuaLemmings to New Formats
. This pack, if my memory serves me correctly, includes a rank called "Troll" as the final one. Repetitive skill spamming is one of the main trademarks of that rank.
Meaning, you should probably give this rank a try as a player before you create similar levels for InfiniLems
. See how you like it in practice first; if you find that you still enjoy this type of level, feel free to go ahead and make as many of them as you like...
I bypassed this 2400 pixel restriction with "The Grand Puzzle" (which is 4000 pixels wide), the last level from Lemmings World Tour - but that was only possible because I created the level in Old Formats and then converted it directly (with the pack converter / cleanse levels inside the New-Formats NeoLemmix player) without opening and saving it in the new editor.
Thanks to the Cleanse-Levels feature, I guess it would still be possible to create levels wider than 2400 pixels in the Old Editor and then convert them inside the New-Formats player... That doesn't mean you should do it, though.
I've just shown you the door, but I advise you not to walk through it...
EDIT: And as namida said below, performance is definitely an issue with such a level width. I switched off the high-quality minimap for "The Grand Puzzle", and I would definitely not advise anyone to play it in high-res mode. Since you like high-res mode, being its main creator, you will probably have to pick and choose between stable, smoothly-running high-res levels and very wide levels
.