Links between some of the stations in the Blackwater Valley (Farnborough Main & North, Ash Vale & North Camp, etc) could be fairly useful. Although a station a Farnborough Gate (at the McDonald's between Farnborough North and Blackwater) would pricky be close enough not to justify a link.
Likewise, I think a new junction to allow trains to run west to North from Farnborough to Frimley and North (under the main line) to west to allow the reverse movement without impacting more than needed on the mainline would also be beneficial (not least in allowing new rail services to run but also as a useful diversion route to allow trains to bypass Woking during times of engineering works, or maybe freight during times of disruption).
Yes such a link would be much more costly than an automated shuttle, but then it would also attract a lot more people to the rail network. As a new service could run Basingstoke to Ascot via Farnborough (extend to Salisbury once that's got wires) with the possibility of new stations at Basingstoke leisure park, Old Basing, Fleet West (near the leisure centre), Southwood, Frimley Green and Watchmoor Park (large business park and Sainsburys). The could be more stations on the Salisbury leg, like Oakley, as well.
Given that the Aldershot Urban area has a population similar to Plymouth or Milton Keynes, in an area where there is a relatively large amount of traffic and where small stations like Hook have about 700,000 passengers a year and places like Winchfield is potentially due to have thousands of new homes over the next 20 years, it is likely that such a link with the associated rail services could be viable.
