Well, now its is time for my worthless opinion,
Lines, squares, volleys, they are great, fun and accurate (not saying accuracy is fun but y'never know). Big blobs wandering round the place doin' what ever they feel like, nah...
on another point, shouldn't line infantry regiment be composed of half pikes and half gunners and a single captain, as it is more accurate and would allow regiments to develop new formations and their own way to form up a Pike-and-Shotte line. it would be fun. plus it would be more fun than just a pike regiment or a musket regiment, one would be destroyed at range (the pikes) the other destroyed by horses (the Muskets). Just thought, rather than lb, (line battle) it could be a sb (shotte battles)
Also, as for the composition of armies and balancing issues, each army should have its own strict unit list, for example, Poland must only have 1 unit of Hussars as they are very, very powerful, The Tartars must only have 4 units of common horse archers, rather than a massive army of them etc, Sweden must only have... the list can go on. the armies would be really planned out, 4 cav regiments, 6 pike and shotte regiments, 1 engineer, 1 skirmisher, etc
Jus' my thoughts, I hope formations prevail over tactical (*sigh*) blobs,
Thanks for readin'