In a word, nope.
In a few words, there's not any planned change for the session timeouts to be changed.
Your asessments of previous timescales, current timescales and reasons behind it are all pretty poor i'm afraid.
It's never been set at 10 mins. Default for the software is 15 mins. VT is currently set to 45 mins. It's been set like that since April so can't be that unbearable for you to have only just posted
Some of the reasons for it's use include making the forum come across as busier for people browsing through (encourages more users to join), allows longer for reading big threads if a user is signed in without the remember me box ticked (stops the session timing out and needing to sign back in if the page hasn't changed for 15 mins), effectivly less server usage needed to handle longer expiring sessions than repeated shorter sessions.
Seeing a site with only a few numbers online tends to have a negative effect in that people only come for a glance and not to post. The end result of that scenario is that the site closes.
It's not a case of doing it for the figures. If it were about 'the figures' then i'd have packed this place in long ago as it doesn't have the potential to become massive. It's site based on a niche with a localised membership. That limits it's size to begin with. It's about keeping the site active and open.
Do you recommend they're changed on other sites ? I know there's a few places with longer/similar session timeouts.
When you set up your own site Rich you can do what you want
Apologies for a blunt'ish reply but it narks me when people tell me how to run mine
P.S. here's the last time it was mentioned --> how fkin many