Can we get a some Map or StartUp option to replace following lines? No Gap from center to max radius — all tiles are allowed.
It helps with https://mods.factorio.com/mod/RenaiTransportation mod

--         if not (cache.range < x and x <= cache.range + tile_width + gap * 2
--           and cache.range < y and y <= cache.range + tile_height + gap * 2)
        if not (max_range < x and x <= max_range + tile_width
          and max_range < y and y <= max_range + tile_height)

P.S. Thanks for the mod. Tbh, I was already planning to make the same mod (the same approach with selecting cells on top of game entities)

Hmm, I'll have to play with renai transportation at some point to understand what would make the most sense.

The suggestion to not have gaps from center is something I've actually already implemented in order to have proper support for Smart Inserters, but I didn't expose it in the standalone mod because I just considered it to be extra complexity exposed to the user (and quite frankly the startup settings for Smart Inserters are not easy to understand, so I didn't want to have that same issue). If you're wondering, it's done through "incremental" instead of "equal" for the "Max range of each inserter" setting from Smart Inserters.

I'm considering 3 things
1) add a bool map setting to "fill gap for long inserters" or similar
2) add a technology that does exactly that instead of the map setting (which would come with a startup setting to enable the technology instead. Probably off by default)
3) change nothing. But I've already had a note to look into renai so this is less likely

P.S. Thanks for the mod. Tbh, I was already planning to make the same mod (the same approach with selecting cells on top of game entities)

Yea I know of a few people who've had the idea, and I mean hey, it's an intuitive solution to the problem. I'm glad you like it :D