It would not be consistent with previous Trek to use shuttlecraft as weapons. DS9 confirms that small craft cannot really make dents in starships even when specifically built for the role and called "attack fighters". And the Scimitar was a pretty fearsome starship opponent, way beyond the capabilities of armed shuttlecraft even with a hole in the bow and shields at 70%.
It would, OTOH, be consistent to use shuttlecraft for transportation.
1) If the ship's own centralized transporter system was down, the independent transporter units of the shuttles could be used for the short hop from the E-E to Shintzon's bridge. That is, unless the only transporters even theoretically capable of defeating the double obstacles of the Bassen Rift and the enemy shields were the main ones - which would be very consistent with preceding Trek. So scrap that plan. (Unless we assume Picard's button transporter was an "independent unit" as well, rather than a mere homing aid for the main transporters. If so, the much larger and more powerful independent units of the shuttles ought to have counted. But that button, and the way it was used, never made much sense anyway.)
2) However, shuttles could be used simply for flying across, for duplicating Data's leap in a more controlled manner and with more firepower aboard. Why this wasn't attempted is unclear; if Shintzon were capable of shooting down the shuttles, Data should have been worried about getting shot down himself. And when he wasn't blasted to bits, LaForge ought to have launched a hundred redshirts aboard a dozen shuttles as a second wave of assault.
Timo Saloniemi