If I understood it right, These aspects are included in the Malburian National Differences you may find under the Downloads of this HP (HOW Marlburian, by Roland Nickson). As with the whole HoW-System the aspects of weapons are included in the melee-modifiers.
Please note: you can find the point "Pike and Shot Units" under the optional rules. Look into the pdf-document "HoW MARLBURIAN Introduction".
I think that Roland's version of HoW for the WSS and GNW is really fine.
One of our glayer in our group painted two 1/72 armies for the GNW and I hope we will give Roland Nickson's rules a chance.
Es marschierten drei Regimenter wohl über den Rhein...
Damnitz is correct in saying that I included pikes in the Marlburian ammendments that you will find in "downloads". I'm about to send version 3 to Keith based on the articles I've written this year but my approach has remained the same as in v2.
I've allowed cavalry to use the +1 for charging against infantry, something not allowed in the core rules. That +1 is not applied to cavalry charging pike armed infantry frontally. For fireing, all pike armed units are treated as the next "size" down. That poses a problem if you have "small" units to start with but that would only be the case in an historical simulation.
There has been some recent debate about the use of pikes in the WSS with the case being made for more prolonged retention, even by the Anglo-Scots/British army, than has previously been accepted. For the GNW it is accepted that the Russians and Swedes used pikes, one in six by the Russians, a high 1 in 3 for the Swedes, but both moved progressively towards all musket armed infantry towards the end of the war.
Pikes were on their way out! Units that were using thin linear formations, using firepower combined with the bayonet as an anti-cavalry weapon, could not respond to cavalry attack in the same way as the earlier "blocks" of pike, with shot remaining deep and close to the latter for protection. The Russian pike proportion is closer to the contemporary European proportions recorded in Spanish and Walloon regiments for example. The Swedes, as always, were different; their infantry combined volley fire and a large pike presence, as part of a very agggressive attacking formation. The high proportion of pikes has been explained as reinforcing the attacking ethos, or alternatively as the Swedes not being able to arm all of their troops with muskets, or as a combination of the two! Regardless, the main user of a significant pike armed infantry looked to use these mainly against enemy infantry and not particularly as an anti-cavalry weapon. The Swedish advantages in this area are reflected in their classification as "Shock" infantry rather than as anything inherent in their use of the pike.