As per title it would be nice if you could set somewhere in which mode MicroWeb will launch by default thus bypassing the choice menu.
My suggestion is if possible to integrate with MTCP.CFG adding a [MicroWeb] section, if that's not possible either having a MICROWEB.CFG or a MICROWEB environmental variable could be valid solutions.
A command line option could also be a solution of course, but personally I think it would be much nicer to be able to run MicroWeb by simply typing microweb and having it automatically fetch the default option instead of having to type microweb -something videomode which would require an extra wrapper batch file to shorten it back up