Aside from the string lock (similar to Draw-Loc)my designs are "in-swinging" very sim. to reverse limb tech.
Reverse limb tech risers are mounted rearwardly of the end of the crossbow (and ballista bow)so that the weight is closer to the body.
Holding a ten lbs weight at arms length is a lot harder to do than if it was held closer to the body.
For folks with shoulder probs or strength probs (carpel tunnel, arthritis etc)the pain or effort eventually makes the sport more painful than fun.
A lot of aging archers are reluctantly switching over to crossbows now they are becoming legal in most states.
Also my designs allow a build that is very light and compact, and can be used either in a verticle position or a horizontal position making for a vertical crossbow.
Technically my designs are ballista's, similar to ancient siege-engines (torsion based). Reg. bows and crossbows are limb powered. My blog for add. info. http://warhammer1.wordpress.com/
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