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Just reading all the proposed rules and trying to envision the world of 40k. Imperial guardsmen love to dig in and outlast the enemy, and what screams dig in and outlast more than mine fields and obstacles.

Now I understand that's what terrain set up is for, but would it not make sense for an imperial general to spend his resources on setting up a good position?
On a different thread there is a discussion of a new combat elite unit for the Ig and I would like to propose exactly the opposite, one to avoid combat. I know FW has some kind of combat engineer (and i don't know their rules), but we don't in the main book. So would it be viable to create our own? a unit capable of changing the very terrain itself?

Combat Engineer - Advisor upgrade for the CCS. May be take Up to 3 times. Same stat and equipment as other advisers.
Each Combat engineer is capable of placing one of the following: mine field, tank trap or AA turret. Additionally engineers may place 1 trench.
All terrain upgrades are placed exactly like units during the IG deployment phase.
Minefield - A region no larger than 4" in diameter may be placed anywhere with in the IG starting deployment zone. This zone counts as difficult and dangerous terrain but does not give any cover.
Tank Trap - A region no larger than 4" in diameter. This is impassable to any vehicle and provides a 5+ cover save to non-vehicles.
AA device - A 2" diameter AA turret, May fire 1 Hunter Killer Missile per turn at a BS of 5. Counts as TL vs. Flyers. Carries only 4 HK missiles.
Trench - A region no larger than 4" terrain. Provides 5+ cover to infantry, does not block/hinder line of sight. Does not count as difficult terrain.

Very creative I like it, is it limited to one of each type for one ccs ? Or can they spam three aa turrets?

Another idea you could do for a minefield is treat it as a standalone expendible ability you can purchase from the codex.

Minefield- 50 points per minefield, max 4. Once detonated, a minefield is expended and can no longer be used.

For every 6" or fraction therof (rounding up) an enemy unit moves or falls, you must roll a D6. On a roll of a 6, that unit suffers Ordinance Barrage D6 Str5 ap 6 hits. Hits against vehicles are resolved against rear armor. Skimmers and jetbikes are unaffected, jump/winged/deep striking troops roll a single D6 to test for detonation in this way.

Only one minefield can be detonated at a time. This hems in mech opponents, but on the flip side, they can use a very strong vehicle, like a Land Raider, to 'clear' a minefield since the mines will detonate whether they can damage the target or not.

Command Activator- +10 points to CCS. If the CCS has not moved, the Company Commander may attempt to remotely detonate mines. This resolves the same way as the Master of Ordinance's special ability (Large Blast, 3 D6 scatter, hit on scatter die resolved as 1D6 scatter) which expends one minefield. Both the MoO and Command Activation may be used on the same turn though they count as entirely separate attacks.

I really like the ability idea, all of these are good ideas

Minefields are detailed in the Apoc book as a strategic resource if you are interested.

Yeah that's what i though most of these options are either terrain, strategy's for apocalypse or all ready made by forgeworld e.g. the manticore emplacement with AA missiles.

You can easily include Minefields in your Imperial Guard army by making some Minefield terrain pieces, bringing them with you, and using them in your games.

Maybe look at the rules for cluster mines on scout bikers, might help give you more insperation but as it is i love the idea

I believe that mine fields were covered quite well in the old Codex: Catachans, and even included different types of mines (frag or plasma.)