@shevegen do you agree that the log messages in `Help->debug messages` are enough for debugging the VTE libary loading or do you still need more? IMO this is enough; the most obvious thing to check is the existence of the terminal tab. And if it is missing, the user knows there is something wrong or she just disabled the VTE in the preferences which is easy to check.
IMO 2, some widget to show whether the VTE library could be loaded or not is not necessary at all, as you already know that it isn't loaded properly if the terminal tab is missing.