Hello Okona, thank you for your input and sorry for the late response.
On which platform are you playing and what are your specs? We haven't experienced input lags so far.
As for the command line, I can't say much, because Kevin has way more knowledge about coding and command lines than I do. I can only say that we have gathered A LOT of feedback from all sorts of players, which led us to the input line we currently have. We believe to have the best solution to be accessible to both coders and players who don't know anything about it. But maybe we can have a customization options for buttons like TAB in the settings.