I would like to see this limit extended again, when scripting it's typical to execute things in editboxes.
Not only I lose commands but even rebooting mIRC and losing them that way can be equally annoying.
I'd like a big increase but would rather have an option to save the history to a file, which is difficult to script natively, than to get a small increase.
I think the current limit is 100, can we get 300? Another feature that was asked in the past is to be able to access the history of editboxes as well as be able to /clear the buffer (delete Nth line as well).