Something like an online form with with existing technology would be too easy.

I am saying this as someone who has made almost all of his income off technology.

I (or my assistant) would uploaded all the bills to be paid to the property management software, and the office manager would cut the checks and get them signed (bills), and I would actually pay the owners with EFT transfers through the PM Software we used.I started My company because the broker at Gallery of Homes was more focused on growing her sales force and had no interest in Property Management, and would not allow me to implement new online tools to faciilitate growth (she was afraid of technology).     

Technology hasnt disrupted the industry and likely wont because the actual reason agents exist is to provide liquidity to the market. 

Why or why not use this kind of technology for showcasing homes?

Constantly evaluate your portfolio, both to run numbers on existing holdings to see if upgrading or repositioning or adding technology can increase profitability, and to analyze whether you should sell and invest in a higher yielding asset.4.

With technology and people’s busy schedules why would you not want a screened prospective tenant to be able to view the property at 7pm because they just got off work?

I wouldn't use such technology in a rental.

If you are concerned about her ability to adapt to the technology needed to make the payments, just allow her to send checks.  

After reading the discussion here, it appears that one needs a strong marketing budget and knowledge of websites and technology to make this a successful marketing campaign.