Mate, firstly im a fan of the good old pressure cooker...thats how i do my stews..
When ever i do a stew, i often do 2 cooks...
The first with the meat, & preferably the bone as well...so if doing roo, maybe some backbone/tail...my guess is if using roo some bone will be a must--try to get some of the fat out from the bone marrow for flavour, so maybe even break the bones to open them up to aid in this...?...just a thought...
Also throw in a few vegies...i use sweet spud, spud, plenty carrots, an onion (try a red onion with roo-its a little sweeter) and mushies and celery...definately celery--always celery...all along with your tomatos, or i throw in a can of crushed tomatos...not too many vegies at this point, the idea here is for a stock/flavour base.
cook that until the meat is basically cooked--that gives me the cooked meat with a meat & vege stock basically.
Then i re-cook it again for the vegies--so throw in the amount of vegies i want for how ever much meat there is...(if all the vegies are cooked for the same length of time as the meat they turn to liquid--well in a pressure cooker they do anyway, so i re-cook with vegies for a short time so they have some firmness to them & its not like eating baby food--when im old(er) and have no teeth ill just have to cook it once...

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I usually throw in some capsicum, zuchini etc at this point...what ever takes your fancy...go rustic & write it down...!!!
Throw in a table spoon (depending on size of cook maybe smaller spoon) of curry powder, & one of gravox if you like, & season and herb up with what ever herbs you like...a decent amount of black pepper is always mandatory for me, and you usually cant go too wrong with basic herbs like rosemary etc.
At the very end, i throw in a can of peas...stir through and devour...
I like sweet flavours as i have a sweet tooth...hence the carrots, sweet spud & can of peas at the end...if you want strong & earthy but not so sweet, try vegies such as parsnip, turnip and sweed & cut back on the sweeter vegies... try the larger darker mushies, & more of them--they are stronger in flavour...
If you dont want to use gravox, do a long slow sautee/cook first using lots of mushies, some vegie water & big knob of butter...if you sautee mushies long & slow enough with butter you get a nice creamy sauce...so you could try this as a nice sauce base for the roo stew...
Send pics mate...and remember go rustic & write it down so you know what to do/not to do next time...im hungry now...!
The man who knows everything, doesnt really know everything...he's just stopped learning...