Should I write a new forex simulator for Mobile devices?

Hi , I'm thinking about writing a new forex simulator for mobile which is :
1. Allow you to import your own indicator in to it - current mt4 and mt5 does not allow customer to put custom indicators into it , i don't know why
2. Allow you to import chart data from certain time (you can download history data from internet and put it in your phone to run it), and make it run in the screen (you can control the run) so that you can practice buy/sell/trying new trading system/backtest with your own indicator in the neat of time with your own phone , don't need to touch laptop or desktop to do that

I want to see the potential people who are willing to use this new forex simulator , i just have an ideal about it since its inconvenience for me to test a new indicator or trading system when I can not touch my personal computer (for example : free time between break, or waiting for my wife to go shopping)
writing a new simulator that can read and understand mq4 file with its own syntax is difficult , so if not much people in there want to use it, i will cancel that project.
Please leave comment if you are interested.

P/s : this simulator will be free to use, I won't sell it, I just want everyone have a good time trading.

If there would be a simulator on a pc where can run any Multi time frame + multi pair indicators from mt4 and mt5 based on downloaded tick data
without any issues. That would be so strong tool.

Unfortunately there is few backtesting tools but they are not capable and simple.

MT4 backtester have own issues of running multi TF and Multi pair backtesters.
Mt5 can do that but its pretty slow.
So The idea would be good for mt4 indicators for the people who cant make test.