I have a few suggestions on LSPDFR. If these suggestions don't work for an official version of LSPDFR, they might work for a mod I guess.
1)Will more variety in suspect reactions be added? Ex. Some suspects surrender/give up the instant they see you rather than always forcing you into a foot chase(if unarmed) or shooting you(if armed), or some suspects fake surrender and either open fire suddenly or run away. Not all suspects in SWAT 4 immediately begin shooting, as some of them like to run away or fake surrender first. I've only seen armed suspects in LSPDFR start shooting the instant they see me so far.
2)What about shouting for compliance(instead of holding E) and enemy morale? Suspects might ignore shouts for compliance if they have high morale, and are more willing to surrender if they are wounded, just got tased recently, saw a partner in crime get shot dead, etc. Suspect morale in SWAT 4 also seems to vary a lot. Random, untrained two-bit thugs in SWAT 4 are usually more willing to surrender while trained North Korean soldiers shooting up a hospital almost always prefer to go out in a blaze of glory, aka suicide by cop.
3)Penalty system? For example, penalties for unauthorized use of lethal force (ex. shooting a fleeing, unarmed suspect in the back of the head)?