Explain the problem as you see it
Currently, only 100 child items can be displayed at a time. While I've managed so far with workarounds and haven't encountered major issues, the truth is that any outliner or database system on the market should be able to handle more than 100 lines.
Perhaps you could try gradually increasing this limit – maybe to 200? – to see if the system holds up. Then, you could use patches or fixes to continue improving and optimizing the system... Even if we had to set a maximum limit, that would be acceptable, as long as the system can handle that maximum number of items.
Why is this a problem for you?
For example, I have a supertag with, say. 8,000 items. When I open it, the system doesn't show me how many I actually have – it doesn't read beyond 100 items. Only when using filters can detect something if the result is less than 2,500.
Suggest a solution
This capacity needs to be expanded to make the system truly functional.