If you implement mercenaries in PvP, and can only be called out when you are in trans, that will give Rams a huge advantage(High TG).
They can allow their mercenaries to be "active" for a longer time than Surges and Patches can.
On the contrary, having mercenaries while being in Bot mode will give both Surges and Patches an advantage over Rams( Surges and Patches aren't transforming masters; Surges use their guns more effectively and in Patches' cases, they are masters of trans attack and trans defense).
"No drops" is a good suggestion(ensures that a match would be based only on pure skills and exceptional luck).
{b} isn't really wise. This would result in a huge amount of +7 sets, thus causing the gigas/coins/bs value in the community to be even more inflated. Multi-Client-ers would take this to their advantage and "cheat".
{cs} is rather good, I'll say. No coin stats meaning coin-naked sets battles.
{ns} is similar to {nd} and {cs}.
Finally, I would say {nd}, {cs} and {ns} should be implemented as all this tags would mean "Pure PvP".
And maybe make Pure PvP{pp}. This tag will mean {nd}, {cs} and {ns} would be activated altogether(for those hardcore PvP-ers).
Have a nice day
~Xeno