Pike and Shot units: Shoot as the next size down. Cavalry lose the charge bonus when fighting frontally against pikes; OR treat units with a 1 in 6 or less pike to musket ratio as musket armed in all ways.
Support: In re-fights it became apparent that the support rules did not encourage the use of brigades in battle lines. For WSS this is particularly a-historical. For support purposes count the following: Friendly units within support distance and wholly within the flank zone of the unit claiming support; A maximum of one unengaged friendly unit in support distance and wholly within the rear zone; Unengaged friendly units within support distance of the enemy unit being attacked. Support cannot be given by artillery, reforming units or units that start the melee phase with 4+ hits. Flank support CAN be given by units that are engaged in combat.
No, they haven't but the games we had early in testing indicated we needed to do something. In the first Ramillies cavalry battle we used the standard support rules. Both sides were laid out in multiple lines and with individual brigades in a single line of units. As soon as the game began both sides started to reform their brigades into double lines so that front units would receive support from 2 second line units. The rear lines of brigades were moved up into the front line to maintain the frontage and in the same formations. Both sides ended up with almost everything in a single line of brigades with units formed checkerboard to maximise support factors. Totally within the rules but not the way cavalry fought in the WSS. For Ramillies game 2 I changed the support rules to allow only support from unengaged units in the flank sector of a unit in melee. What I hadn't realised was the fine balance in your rules (a common fault of people "fiddling" with mechanics!). While it encouraged brigades to remain in line and for whole lines to go forward together to prevent a support advantage at the end of a line it had a dramatic effect on the melees. With all units engaging and no-one to give support factors, lots of melees went to a second round and fully a third of all units were "done for" at the end of the turn! Overkill. With support factors many melees are resolved in the first round by one side or the other, or both, receiving 4 hits. A minority go to a second round and some units are done for. In one-on-one melees only units that carry hits already are vulnerable to first round destruction. Back to the drawing board. The optional support rule I've described encourages players to use linear brigade formations. I was tempted to drop rear support entirely until it was pointed out that such support was given on occasion. My alternative option is to allow only a single unit of a different brigade to give support from the rear sector. That does reflect actual practice more faithfully as exemplified by Marlborough's use of his Dragoons to support wavering assault troops at the Schellenburg, the Blenheim "column" or any number of instances of infantry supporting wavering cavalry to their front.
To be clear, as all other HoW rules apply then the total number of supporting units remains at a maximum of 2.