I agree with number 1. Plus an effects loop on the lower watt combos and they would be perfect! 4 would be useful but not a must have.I have some wishlist for future Rumble V4 combo.
Keep all the current V3 features, upward panel ,lightweight and vintage combo look , but need to add :
1, an accurate Built-in Tuner
tone shape control
...
4, Clean channel and Overdrive channel with Seperate EQ and tone shape control
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Just ask 
We fully expect you to rectify the situation forthwith, and to regale us with new and exciting Rumble Tales! 