My suggestions.

[Unli@RB]

Bank to be robbed only once a day;
Limit the vehicle's own to 5;
To place a markets/places/houses at Bayside Marina;
To place a markets/places/houses at Las Barrancas;
To make a jobs/missions for score points and money:
Coalmine closer to LV - Placing 5 dumpers and you get in them and write /coalmine and going on other world where are only you and start making the job, and the job is to collect all checkpoints and back to the place from where u start work and then you get 1 or 2 score and some amount of money;
I have more ideas for more jobs like that and there they are:
Pizza job at Montgomery(To deliver a pizza to the neigbour village Paloming Creek) - start the job from the pizza place;
Sweeper job(To clean the streets at Fort Carson) - start the job from the building what is closer to the coalmine on Hunter Quarry;
Bus job (To go on random bus stops over the map and go back to the start point and take more score points and amount of money than other jobs b'cuz its job on all the map) - starts from the El Castillo Del Diablo;
And more jobs like these what's getting on your mind.

[TripleH]

Bank to be robbed only once a day;
+1 with more amount of money.
Limit the vehicle's own to 5;
+1

[[Lsrcr]Yakuza]

I agree with both

[GuitarJohn]

Limit the vehicle's own to 5;

+1

To make a jobs/missions for score points and money

There is already some minimissions such as delivering money to atm's or collect trash around city with rubbish truck, but i also think that more minimissions like that (for example pizza delivery) would be much more fun.

[OsamaAbouelhassan]

+1 .. To have 5 vehicles , Johnson already told me that something similar to this will be added in v8.1 through this
viewtopic.php?f=386&t=52638