After reading through everthing, all the General changes seem great. Everything else, which seems like a whole lot of changes, seems worth testing for the fun of it. But at the same time, I am a little leery of overhauling EFA armies without being comprehensive with the other factions... Most of the changes you've outlined here seem alright, but I have some reservations about a number of them:
Conscripts
I get the rationale. The slot_item stuff seems needlessly complex though.
Demo charges
Stun and forced retreat seems unnecessary. Suppression, if anything would be more appropriate.
M3A1 Scout Car
I dunno, beefing it up like that just seems like asking for problems. Especially with how late OKW's panzerfaust is atm.
Guards Troops
Drop rate from 0.1 to 0.33...? Why not just revert them to prepatch performance, and then implement the slot_item purchasing changes?
DSHK and Maxim
Go nuts guys. Those have been a can of worms from the start. What about switching the DSHK and 120mm for the Maxim and PM-42? As in, DSHK and 120mm in T2, and the maxim and PM-42 as 0CP call-ins? Just a thought. Move the Sniper to T2 with all the attention Penals are getting.
All the other Soviet changes are more or less worthwhile changes. The volume of changes might make it hard to measure their individual impacts though.
Pak40 TWP
Definitely worth testing. May I suggest working the TWP shot to (maybe only) stop the tank in its tracks when it hits, forcing it to start moving again from a standstill? Sort of a thematic counter to Ram.
But a tank at a standstill is the prime benefit of TWP.
Command P4 aura
I guess. At the same time supporting a teammate with an aura really shouldn't be discouraged IMO. I feel like there's got to be a solution to auras. If anything, perhaps a unique bonus for teammates that's straightforward and minor?
Panther
Interesting. I still feel like it needed an accuracy boost more than a damage boost. It's armor is what WOULD make it a particularly strong adversary for heavies, but it can't hit the broadside of a barn.
Tiger
They go in line with the changes to the IS2, so I guess they'll work... It's just you've got to consider that the issue with the Tiger has long been it's lack of durability. With these boosts to heavy tank damage, that shortcoming will be even more pronounced. Staying power is more what the Tiger needs.
Elefant
I guess there's no stopping this train... :| HE barrage seems... unnecessary and only to justify neutering it's ability to do its one job.
Spotting Scope
3.5 seconds seems entirely too long.
Everything else mentioned seemed worth a shot. I'll have to see if I can get some games in this weekend.