The dim/ dip feature was a great idea at the time to improve daytime visibility. One minor drawback according to the press at the time was some manufacturers used it as a reason to do away with the sidelight bulbs so if a headlight bulb blew there was no sidelight either. Personally I didnt think that was a realistic objection as surely someone is much more likely to notice a headlamp bulb out and do something about it straight away.
i'd be tempted to fit the dim/dip unit if it's there and it would't take too long to fit. You could use it together with the conventional sidelights to ensure you never fail an MOT on sidelights. If it looks like a pain though leave it out, sell the dim/dip unit on ebay for a couple of quid and buy some LED daytime running lights.
In the same way as bikes can often be 'invisible' to car drivers, roadsters can be invisble due to their height, especially with the terrible rear view from many 4x4s. Anything that can improve visibility could prevent an accident.
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