Lovely dream, but your scientific foundation is totally lacking.

You posit that increased global warming of Mars would lead to a mild runaway greenhouse via CO2 and H2O release to the atmosphere...

Unfortunately, the recent work on thawing CO2 (Andrew Ingersoll) shows thast there may not be enough available CO2 to make any useful difference. I am personally troubled by this - there "ought" to be more COI2 in the system, but we need to find it, rather than dream about it.

You then go on to say " This exposed carbonate would be expected to decompose under an aqueous environment releasing more CO2 to the atmosphere"

This is absolute total stupidity and demonstrates your lack of scientific comprehension. Sure, you can cut-and-paste abstracts and pick keywords, but you obviously don't UNDERSTAND whay your posting.

1) There is no observational evidence for surface carbonates at V1, V2, or pathfinder sites. Simply seeing whitish material is an inadequate diagnostic criterion.

2) Even if this were carbonate, an aqueous environment acts to CREATE carbonate from CO2 and rock, NOT release it.

You need high temperatues to do this (Think limestone Kilns, calcining, deep metamophisn, or magma-chamber type temperatures).

In summary, there is a very real problem in increasing Mars' atmospheric pressure to any useful degree, no matter what you do with the solar constant or the spin axis.