1) How it would benefit others? (Not just you, but 1,000s of others people using the same plugin.)
Most builders use a barrier to block players from leaving
2) What would happen if we won't implement this feature? How's your server being affected?
Cannot use it :(
3) If suggesting something new - Can the old system be modified/improved instead?
Yes
#Only spawn particles in open arenas?
Realistic: true
Whitelist the block barrier so it can "SNOW" under it.
Or just a list of allowed blocks in the configuration
1) How it would benefit others? (Not just you, but 1,000s of others people using the same plugin.) Most builders use a barrier to block players from leaving
2) What would happen if we won't implement this feature? How's your server being affected? Cannot use it :(
3) If suggesting something new - Can the old system be modified/improved instead? Yes
Whitelist the block barrier so it can "SNOW" under it. Or just a list of allowed blocks in the configuration