New day, new app in Cydia: Memory Tap. This tweak will allow you to free some memory with a pre-defined command that you will set via Activator. I got mine on double tap the home button, since I don’t use ProSwitcher anymore ( I use Circuitous now ).
First you will need to add the following repo in Cydia : http://iphone.ashman.com/beta/ . Install Memory Tap, and set your command via Activator. That’s it. Remember that this is only a beta version and not quite effective. Before using it i had 39 MB of free RAM, after i used it i had 44.