Yeah, wouldn't hurt to add something like this; however the issue here is we need to make sure Complex isn't just flooded with a huge amount of new rooms which would in turn reduce the number of people in each room.
The 10k + room wouldn't be a bad idea for skilled sparrers who just want to vs each-other, however.
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One GST is a huge headache for the staff team as it is, I really don't see two happening. The main focus is on automation; things that don't require staff intervention.
Yeah - a good amount of new rewards will be added hopefully, and all levels will be revamped.